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  • Offer Profile

    We develop, design and fabricate filtration systems for solid/liquid separation in the processing industries as well as Vibratory Mixers and Single-Use Technologies. 

Product Portfolio

  • Sophisticated, highly automated and fully enclosed filtration systems for either wet or dry discharge, or alternatively for semi or fully continuous thickening. System benefits include high efficiency solids removal, precious metals (catalyst) recovery, patented heel volume filtration, cake washing, cake drying and in-situ cleaning of the filter media. DrM filters are routinely used in many industries including oil & gas, petrochemical, specialty chemical, fine chemical, environmental, mineral and metal processing, pharmaceutical, as well as food & agrochemical. Amongst candle filter suppliers DrM has proven to be one of the most versatile and flexible to adapt to any client request.

      • The FUNDABAC® candle filter has captivated users all over the world for its exceptional design and operation simplicity. The unique cloverleaf shaped candle element design of this tubular pressure filter is at the heart of the self cleaning FUNDABAC® filter system. This design allows for efficient solid-liquid separation resulting in a polishing grade filtrate while guaranteeing adherence of the filter cake to the cloth throughout the entire filtration cycle, as well as effective and automatic cake discharge. Once the clean filtrate has passed through the filter cloth, it flows into the perforated peripheral tubes and then down to the bottom of the candle, before rising in the central tube toward the registers.

        Regardless whether the solids discharge is in slurry or a dry cake form, it is achieved by a rapid counter-current flow and pressure from the inside of the candle. The patented candle structure accentuates the effect of this counter-current flow. A quick-pulse air or nitrogen (gas) blowback results in a rapid flexing of the filter media away from the candle. This breaks the cake away from the filter media, causing it to fall from the candle to the bottom of the filter vessel.

        The FUNDABAC® candle filter is perfectly suited for automatic operation via PLC or DCS. This ensures reliable product quality and reproducible batch filtration. It is designed to operate in the absence of any moving parts. As a result, maintenance requirements and costs are extremely low. The use of new synthetic materials, particularly filter internals, contributes to reliable operation and long life of the filters. For inquiries or further information, please complete and return one of our Application Questionnaires.

        Materials of Construction
        • Filter vessel: CS, various types of stainless steel, Titanium, High Nickel Alloys, Fibre glass
        • Liners: Hard rubber, PVDF, PFA, PP, Halar
        • Filter internals: Stainless steel 316L, PP, PVDF, PPS
        • Filter media: PP. PVDF, PTFE, PPS, PEEK, PE, UP, SS 316L

        DrM can supply stand-alone candle filters or complete, skidded turnkey packages. All of our filters are custom-designed to meet the needs of each application. Unique Options are available above the minimum supply scope to optimize performance, operation efficiencies and flexibility. These are some of our options:

        • Specialized Filtrate Piping
        • Pressure Reducing Valve
        • Process Engineering and Control System Packages
        • Discharge Valve
        • Overfill Protection Device
        • Spare Parts

      • The CONTIBAC® is a slightly modified FUNDABAC® candle filter used as a continuous filter thickener, producing concentrated slurries. Clear filtrate at a high flow-rate is achieved. As a self cleaning filter, a CONTIBAC® features back-washable filter elements that are flushed back with compressed gas or clear filtrate so that solids get freed into the liquid and the resulting thickened slurry is drawn off intermittently or continuously from the bottom outlet of the filter. This solid-liquid separation process mainly applies when a continuous or semi-continuous flow is required and inlet suspended solids are minimal. For inquiries or further information, please complete and return one of our Application Questionnaires.

        Summary & Advantages
        • Semicontinuous or fully continuous thickening operation
        • Clear filtrate at a high throughput rate
        • Produces concentrated slurries without flow interruption
        • Unique cloverleaf shaped candle element design
        • High solids capture efficiency
        • Sub-micron particle retention capability
        • Can be designed to work by using filter aid (precoat, body feed) according the needs
        • Uniform filter cakes dependably adhere to the filter cloths
        • Can be designed to recovery valuable precious metals/catalysts
        • Fully enclosed design and automatic operation means virtually no operator intervention or materials contact
        • Very low operating costs
        • Lab and pilot units readily available for testing under the supervision of trained field service representatives

      • DrM designed the STERIBAC® candle filter specifically for the pharmaceutical, biotech and food industries where GMP shall be followed. These industries have to adhere to strict regulatory agency requirements relating to particle shedding and sterility and require reliably clean and sterile solid-liquid separation steps. The STERIBAC® filter design is derived from the well known FUNDABAC® automatic filter which has been applied in thousands of applications in which the capture of solid particles from liquid streams is required and dry cake discharge is regarded as advantageous. The task of scale-up of solid-liquid separation process steps in the pharmaceutical and bio-process industries must combine the sophistication for programming that can be validated with the simplicity of design and construction. STERIBAC® applications include the separation of biomass from fermenter slurries, the separation of precipitated solids in downstream processing lines, activated carbon treatment of liquid product streams, heterogeneous catalyst separation from hydrogenation reactions, the capture of cell debris of both mammalian and bacterial cells, the removal of precipitates in enzymes and plasma, protein fractions, the separation of phases in blood substitutes, as well as crystal separation of injectable antibiotics. For inquiries or further information, please complete and return one of our Application Questionnaires.

        Summary & Advantages
        • A totally enclosed system for high-containment tasks devoid of mechanically moving parts
        • Automation of all filtration steps
        • Simple, modular construction of the filter elements
        • Mobile and flexible design for short production cycles and frequent batch changes
        • Dry, slurry or reslurried discharge of sterile solids into a sterilized container
        • Washing liquid waste minimization due to the patented spray washing system
        • Patented heel volume filtration allows for virtually 100% recovery of both solid and liquid heel and assures batch integrity
        • Cake washing allows for recovery of valuable mother liquor and/or discharge of solids without undesired liquid impurities
        • Easy SIP, CIP and disassembly of all components for inspection
        • Easy handling of filter cake for washing, drying and discharge
        • Filter media that are fully compatible with the product
        • Used in the production of particulate free injectables
        • All connections of the sanitary tubing to meet O-ring sealed GMP flange requirements
        • Selection of process-focussed sterile pump and instruments

      • In solid-liquid separation processes fine particles are often suspended in large volumes of liquid having a low solids concentration. The large filtration area required to handle such streams is in turn resulting in large filter housings, structures, plant footprints and corresponding high CAPEX and OPEX.

        The CONTIBAC® RX slurry thickener technology offers a smart solution for these specific cases. The self cleaning filter elements in the CONTIBAC® RX automatic filter is grouping of multiple long and narrow cores in metal or plastic, surrounded by flat synthetic media cloths; elements are positioned in parallel, collectively providing a large filtration surface area in a compact space: roughly speaking, a certain vessel equipped with CONTIBAC® RX internals can fit up to 3-4 times the filter area with respect to the conventional design.
        Cake is typically only few mm thick, which matches well with the low inlet solid concentration.

        Both the inner core and the cloths are available in a variety of materials, enabling this technology to fit for a wide range of process conditions (e.g. temperature, chemical composition), which is the distinctive sign of DrM separation systems.
        During backwashing, the cloth expands similarly to what happens with the traditional FUNDABAC® and CONTIBAC® design, thus resulting in the same, thorough cleaning typical of DrM filters in conventional execution.

        Possible applications are in principle any solid-liquid separation process involving high flows, low solids concentration and no requirement for dry discharge; references are existing for recycling of silicon slicing coolant and for brine polishing in chlor-alkali industry, to name a few.

        Summary and Advantages
        • Fully automatic slurry discharge filter
        • Small physical footprint due to large media surface area
        • Long service life
        • Minimal maintenance requirements
        • Minimal spare parts and energy requirements

      • The CONTIBAC® SM Filter uses sintered metal (SM) elements as its filter media. It can be either utilised as a guard filter or alternatively used as a stand-alone filter when there is a requirement for a high temperature filtration, where polymer textiles filter media would not be suitable.

        Summary and Advantages
        • Long service life
        • High solids removal efficiency
        • Compact filter housing (small diameter)
        • Suitable for filtering high temperature liquids
        • Designed for relatively low solid loads
        • Wide variety of metal materials are available for both the filter housing and sintered metal cartridges.

        In selected cases, SM elements are installed as cross-flow filters for continuous catalyst removal (e.g. Raney Nickel, precious metal supported on inert carrier).

        Filters in such an execution (CONTIBAC® XF) are typically part of a loop-type hydrogenation reactor.

      • DrM High Flow Cartridge Filter housings are designed for use with High Flow type, replaceable filter cartridges. This product line is for clients who prefer an efficient low CAPEX filtration solution and are willing to tolerate the OPEX consequences, including ongoing cost, typical of disposable elements.

        DrM High Flow Cartridge Filter housings are available in a variety of metallic construction materials to ensure compatibility to the liquid stream. High Flow pleated media filter cartridges have a significant surface area for maximum dirt holding capacity and minimal cartridge replacement frequency.

        • High filtration efficiency
        • High Flow filter cartridges are available in a wide assortment of micron ratings
        • Low CAPEX cost structure relative to fully automatic filters
        • Can be used a polishing or guard filters positioned after FUNDABAC® candle filter or activated carbon columns in amine treatment plants
        • Can also be used as stand-alone filters
        • Special cartridges also allow for high temperature liquid filtration

        The extensive experience and the consolidated know-how in solid-liquid separation processes enable DrM to accurately evaluate both CAPEX and OPEX of a filtration system and propose the most economical technology (permanent automatic filters vs. disposable cartridge filter) based on the specific process conditions (e.g. solid load, flow rate etc.)

      • DrM can supply stand-alone candle filters or complete, skidded turnkey packages. All of our filters are custom-designed to meet the needs of each application. Unique Options are available above the minimum supply scope to optimize performance, operation efficiencies and flexibility. The following is a description of some of these Options

        Summary & Advantages
        • A wide range of Filter Options are available to optimize filter performance, operation efficiencies and flexibility
        • Options include skidding, specialized filtration piping, specialized pressure reducing and discharge valves, process engineering and control system packages, as well as spare parts.
        • Spare parts are inventoried in both Houston and Switzerland. Switzlerland-stocked spares can be overnighted to meet customer delivery requirements.

        Overfill Protection Device
        Filtration involves separation of two phases while one phase passes through a media and the other is retained. The retained phase accumulates in the filter and if not removed at certain intervals, it can lead to all sorts of complications, such as difficulties during removal, blocking or even disastrous damage of the filtering device. There were a number of attempts to control or monitor the loading of filters but results have been mediocre. This has to do with the fact that it is difficult to measure phase differences such as solid/liquid-phases inside the filtering device.

        DrM now developed and patented a new device which does not attempt to monitor the phase but rather the forces acting on the filtering device. When overfilling occurs the filtering elements are displaced and such displacement is detected and a signal indicates that filtration shall be terminated.

        The design incorporates distance sensors which are mounted above certain sections of the filtering device. Displacements of a few mm are enough to activate a signal.

        Specialized Filtrate Piping
        DrM can supply headers which group multiple filtrate outlet nozzles into one single one, a manifold which collects the filtrate from the registers and can act as a buffer for the compressed gas required for blow-back, as well as a register by-pass with associated valves to be used when register-wide drying is implemented.

        Pressure Reducing Valve
        For proper operation, the FUNDABAC® candle Filter normally requires gas supplied at three pressure levels. In order to simplify the process and improve the functionality of the system, DrM recommends the Option of a single Pressure Regulating Valve (PRV) piloted by an I/P transducer. Compared with conventional solutions such as control valves controlled by a pressure transmitter, the PRV allows a much faster response and more accurate pressure regulation, preventing risks of cloth damages due to excessively high gas pressure or of inefficient cloth cleaning due to insufficient gas pressure.

        Process Engineering and Control System Packages
        DrM can support the activities of very large plants as well as small ones with customized Process Engineering and Control System packages. These packages include:

        • Process Flow Diagrams: A simple and immediate approach to all the important process and control information
        • Control Logic Diagram or Step-by-Step Sequence Chart: A matrix of steps and process phases that includes filter filling, cloth cleaning, as well as precoat/prefiltration, filtration, washing, draining, drying and discharge). This is intended to show all valves commands, instruments, loops and conditions, call operator alarms, pumps status, set points, timers, etc.
        • Process Control Philosophy and Process Description: Narrative description of all phases, interlocks and alarms, safety conditions, set points and instruments ranges, etc.

        Furthermore, DrM has developed a self-explanatory PLC software which does not require any programming knowhow. The user can control the process and modify the cycle configuration (add/remove process steps, modify timers and set points) from the HMI with no external assistance. A control panel with programmed PLC is the ideal filter add-on to avoid any process control issue.

        Discharge Valve
        Among the most critical components for the successful operation of a FUNDABAC® Candle Filter is a discharge valve that ensures both a problem-free cake discharge as well as a tight shut-off under pressure when closed. A wide range of disc and valve seat materials of construction is available. The candle element placement and the presence of the heel drain pipe are other factors that make both the selection and the installation of a discharge valve a critical step in a successful system design. Bottom discharge valves are typically required to be within the scope of DrM’s supply.

        Please contact for specific inquiries or general information related to spare parts. Our goal is to provide quick turnaround times for your spare parts orders. Please let us know when you have an urgent requirement and we will do everything we can to accommodate your needs.

    • DrM’s FUNDAMIX® Vibromixers mix liquids strictly by vibration. The absence of moving parts results in vortex-less mixing and homogeneous distribution and emulsification. Excellent pharmaceutical, microbiological and biochemical applications include insulin production, blood fractionations, preparation of sterile solutions, mixing of injectable suspensions in sterile vessels for ampoule filling, vaccine/oil emulsions, anaerobic fermentations, submerse culture of mammalian and plant cells, as well as protein solutions.

        • The FUNDAMIX® is a universal device for mixing liquids in open or closed vessels, under vacuum or pressure, even in sterile conditions.

          It was invented and patented in the late 1960s by Dr. Hans Mueller and subsequently manufactured by Chemap AG under his ownership. The vibratory mixer product line was sold to Graber & Pfenningger GmbH in 1983 and was reacquired by DrM, Dr. Mueller AG in 2012 and renamed FUNDAMIX®.

          The electro-magnetic drive operates at 50 to 60 Hz and transmits the vibration via the mixing device or mixing plate attached to a special clamp coupling into the medium.

          The amplitude resp. mixing effect is controlled by an electronic system and can be adjusted from 0 to 4 mm. The flow direction can be adapted to suit the medium and required mixing effect. The mixing direction depends on the orientation of the conical holes.

          The FUNDAMIX® transfers very little shear force to the process medium and is therefore able to provide a gentle mixing action suitable for live cells or delicate crystals. Still, depending on the working amplitude and the size of the mixing plate, very turbulent flow conditions can be achieved, resulting in high diffusion rates and heat transfer coefficients and optimal solids suspension.

          Standard mixers are in 316L stainless steel, but can be manufactured from a wide range of materials including Hastelloy, Titanium and various plastics.

          FUNDAMIX® can operate continuously without overheating or amplitude variations.

          Principle of Operation
          The mixing effect is produced by a vertical vibration transmitted to a perforated stirrer plate equipped with conical bores with no rotation involved. Due to the Bernoulli effect, this vibration causes the liquid to be pumped upward or downward through the cones.

          Features and advantages
          • No baffles required in the tank
          • No rotating mechanical seals
          • No lubricant required
          • Low installation and maintenance cost
          • Low energy consumption
          • No vortex
          • No friction
          • Long service life
          • Effective & efficient mixing
          • No overheating of liquid
          • No damage to life cells or delicate crystals thanks to very low shear forces conveyed to the medium
          • Simpler sterilization

          • Low viscosity liquids only (max. ~500 cP)
          • Top mounting only (no bottom or side mounting)
          • Rounded tank bottom preferably (flat bottom geometrics are not conducive to optimal mixing results)

        • The FUNDAMIX® is a well established mixing technology for products which require mixing at low shear forces, which is typically the case in the biotech environment. While cGMP practices intend to control production processes to guarantee quality of products, it means that the mixing quality of an agitated vessel needs to be monitored to assure compliance.

          Vibratory action on a mixing plate produces a vertical flow of the fluid. The displacement volume is basically a function of frequency x amplitude. When the drive unit is connected straight to the power supply the oscillating frequency is equal to twice the grid frequency, i.e. either 2x50Hz = 100Hz or 2x60Hz = 120Hz. In case a frequency converter is applied its frequency can be monitored on the device and is a fixed value.

          For the amplitude, however, it is a different issue. It depends on many other influencing factors, such as weight of mixing device, fluid density and viscosity or size and shape of mixing plate. This leaves no other option but measure the actual physical displacement of the plate.

          Visual measurement:

          Traditionally, amplitude is visually measured with the help of a self- adhesive strip placed on the shaft of the mixer which oscillates along with the mixing plate. On the strip there are two lines forming an arrow. When the device oscillates the arrow appears as two arrows forming an intersection point at which the actual amplitude can be gauged. Although it is a quick and dirty means to measure amplitude it is not easy to get the reading right, as it leaves room for interpretation with each person seeing something else.

          Electronic measurement (VM-021):

          Later an electronic instrument was developed which consists of a piezo sensor fixed on the shaft of the mixer. The acceleration measured by the piezo is a linear function with respect to amplitude and with some conversion it gives an analog signal which can be used to monitor amplitude and control the drive unit. As the instrument interprets the amplitude based on acceleration data it needs to be calibrated for each FUNDAMIX® separately. Additionally, the sensor is mounted on the shaft and it cannot be easily transferred from one unit to the other. It is usually applied as a fixed installation.

          Hand-held laser measurement:

          As an alternative to the above instruments we have developed an optical laser sensor, the amplitude monitor. It measures the distance to an oscillating plate fixed on the shaft of the mixer every 1.5 ms. These values are algorithmically converted into an analog reading shown on an integrated display. As we are measuring an absolute distance there is no requirement for additional calibration. This allows the instrument to be applied to all FUNDAMIX® agitators equally, irrespective to other influencing factors such as frequency. As the sensor is not fixed to the vibratory part of the equipment it can be applied as a hand-held battery-operated device to be easily carried around. This marks a new generation of amplitude monitoring instruments and we are proud to offer this to our clients.


      • Single-Use Technologies/Systems (SUT/SUS) have become increasingly prevalent in recent years in Bio-pharmaceutical manufacturing. SUT/SUS are typically made of plastic material and are delivered pre-sterilised by Gamma or X-Ray irradiation. As the name suggests, Single-Use equipment is disposed of and replaced after use.

        There are a number of benefits, compared to traditional stainless steel process equipment. One of the main benefits is that time and energy consuming cleaning and sterilisation procedures are no longer required. Other benefits of Single-Use Technologies/Systems are shorter Time to Market cycles, reduced plant footprint, substantially lower CAPEX and decreased time for changeover resulting in a higher output.

            DrM’s new single-use filter type, FUNDABAC® SU, consists of large surface area filter elements, packed into a fully contained plastic enclosure. It is a clever alternative to disposable filter cartridges for cell harvesting and purification in biopharmaceutical processes.

            Additionally, FUNDABAC® SU design is ideally suited for handling toxic or otherwise hazardous substances in a fully enclosed environment. The filtered solids can be sent for disposal inside the closed plastic bag and do not need to be handled further.

            The increased surface area boosts the filtration efficiency and results in a high throughput. For pharma/biotech applications, plastic components in contact with the process medium can be pre-sterilised, this making CIP/SIP redundant.

            The filter bag is installed in a pressure vessel during filtration. This design opens up the possibility to compress the filter bag by applying an external pressure at the end of the batch, thus also allowing the filtration of the liquid heel. The unique design allows either a once through or a multi-cycle filtration, where the cake can be back-flushed and accumulated on the bottom of the bag. Finally the compressed bag containing the solid waste is removed and safely disposed of in a very compacted form.

            Key advantages
            • High throughput
            • Increased yield in cell recovery and enzyme recovery operations
            • Shorter reactor downtime due to reduced cleaning and validation requirements
            • Pre-sterilised and validated filter enclosure available for pharma/biotech applications
            • Reduced heel volume and compaction of solid waste thanks to the external pressure
            • Fully enclosed containment made completely with plastics ensuring safe handling and disposal of hazardous components
            • Multilayered plastic bag providing superior robustness

            Materials of construction
            • Filter Bag Polyethylene PE
            • Filter Elements Polyethylene PE
            • Filter Housing: Polysulfone PSU / Stainless Steel
            • Gasket: Silicone
            • Connector Material: PE, PP, PA, PVDF, PSU
            • Compliance: USP Class VI; FDA 21; CFR 177; ISO/EMA; ASME BPE: Animal free material

            Design figures
            • Max. Operating Pressure up to 4 bar (g)
            • Max. Temperature: up to 50 ºC
            • Sterilisation Method: Gamma Sterilised or X-Ray Sterilised
            • Batch Volume: up to 1 lt, 5 lt, 10 lt, 50 lt, 100 lt, 200 lt, 1000 lt
            • Filtration Area: Customized, available in various sizes
            • Connector Type: Hose Barb, Tri-Clamp, Sterile / Aseptic Connector, Luer
          • SINGLE-USE MIXER

            DrM has developed a new type of single-use mixing device, the FUNDAMIX® SU system, which combines the proven FUNDAMIX® high performance mixing technology (over 1900 stainless steel executions) with the advantages of a closed and disposable plastic enclosure. A wide range of different connections allows for a modular and very flexible approach in the design of the production chain. For biotech applications the bags for our single-use mixer are delivered pre-sterilized and therefore cleaning/sterilization processes as CIP/SIP are no longer necessary.

            The FUNDAMIX® SU offers many distinctive features of the standard FUNDAMIX® technology, such as low shear force but powerful mixing action, making it perfectly suited for homogenisation, powder suspension, pH adjustment, media preparation, fermentation and many other typical biotech process operations.

            Key advantages
            • Fully enclosed environment made from plastics ensures safe handling and disposal of components
            • Robust and reusable steel shaft for efficient energy transfer to the mixing plate
            • Broad range of common connector types in various materials available
            • Strong multilayered bag film with gas barrier and high chemical resistance
            • Various bag volumes available
            • No dynamic sealing and thus no risk of particulate generation caused by plastic-on-plastic friction
            • Easy connection to all FUNDAMIX® drive devices
            • Customizable connectors for instrumentation and reactants feed
            • Completely sealed shaft connection for quick and easy bag assembly
            • Chemically resistant and robust polymer plate for high mixing efficiency
            • Bottom mounted outlet port allowing homogenization during draining

            Material of construction
            • Mixing Bag: Polyethylene PE
            • Mixing Plate: Polyethylene PE
            • Mixing Housing: Stainless Steel or Plastic
            • Connector Material. PE, PP, PA, PVDF, PSU
            • Compliance: USP Class VI; FDA 21 CFR 177; ISO/EMA; ASME BPE; Animal free material

            Design Figures
            • Operating Pressure: ATM
            • Max. Temperature: up to 50 ºC
            • Temperature control Heating Jacket (on vessel)
            • Sterilization Method: Gamma Sterilised or X-Ray Sterilised
            • Batch Volume: up to 1 lt, 5 lt, 10 lt, 50 lt, 100 lt, 200 lt, 1000 lt, 2000 lt
            • Connector Type: Hose Barb, Tri-Clamp, Sterile / Aseptic Connector, Luer
          • SINGLE-USE VALVE

            Pinch valves are often used in single-use applications for on/off flow control. As the valve does not get in contact with the process media it does not require replacement of any parts. Only the flexible tubing is being changed as a single use item. For non-pressure designs simple solenoid-driven pinch valves can be used, but when pressure needs to be applied, such as in filtration equipment the significantly tougher tubings together with the internal pressure pose a significant burden to the pinch valve and standard solenoids normally cannot do the job.

            A newly developed design allows for on/off control of pressurized single-use tubings in a compact package. The electrically driven actuator is a microprocessor-controlled geared motor which opens and closes when an ON or OFF signal is received. The tubing firmly sits in a well-defined bed which guarantees uninterrupted operation for many cycles. The valve can easily be installed within a cabinet with only the actuated part being visible.

            The combination of this component with our single use filtration system is a perfect fit.

            • Type: Pinch, non-invasive
            • Model: SU Valve
            • Actuation: Opening: 3 sec; Closing: 3 sec
            • Power Consumption: Idle position (closed or open): 0.1W; During opening and closing (3 sec.): 5W
            • Power Supply: 24 VDC / 12 VDC
            • Signal Input: OFF Position: 0 VDC; ON Position: 12…24 VDC
            • Material: 316L / Polyethylene
            • Max. Working Pressure (barg): 4
            • Max. Working Temperature: 80 °C
            • Hose size: OD 6.35 – 25.4 mm
            • OD 1/4” – 1”
            • Electrical Connection: Power, 12 VDC: 2 wires
            • Signal, 24 VDC: 2 wires
            • Note: User interface via PLC or DCS

          • Use Filters manually, for improved experience and consistent quality it is recommended to run the filtration package automatically. The filtration is a batch operation and hence the operating sequence runs through a number of distinct process steps, such as Filling, Prefiltration, Heel Volume Filtration and Back-flushing. Various process parameters, such as pressures, flow or turbidity can be measured and logged. These can give valuable input to understand the performance of the filtration package, compare individual filtration batches and optimize the protocols.

            To simplify installation and operation, the compact control panel not only houses the PLC but also the custom made SU valves, solenoid valves and air filter regulator for the instrument air supply. Pump, agitator, instruments and instrument air are connected and the flexible single use tubing is easily attached to the valves.

            The FundaStep Controller comes in two sizes:

          • 400 x 300 x 200 mm (HxLxW)
          • 600 x 300 x 200 mm (HxLxW)
          • While both controllers provide a total of 6 SU valves and 2 solenoid valves which is more than enough to operate the complete system, the larger housing allows for additional space to install custom instruments which can be attached to an additional DIN rail inside the box. Both housings have the same compact foot print.

            The process is visualized on an iPad which connects to the controller via Bluetooth and can be placed anywhere within reach of signal. Valve positions, steps, timers and instrument values are all shown on the high resolution touch screen which allows for complete operator control of the sequence to run in various operating modes:

          • Fully automatic loop filtration: The filtration cycle restarts automatically after reaching the end of the sequence
          • Automatic single pass filtration: The filtration cycle stops after reaching the end of the filtration
          • Step-by-step: The operator steps through the sequence manually
          • Manual: The operator opens and closes each individual valve from the touch screen

        • During selection, sizing and validation of process equipment laboratory and pilot testing are indispensable bench tools. In filtration processes they provide important data on flow, pressure, filtrate quality, residual moisture, washing yield, filter aid demand and other parameters. The insight gained serves the process engineer and plant designer for sound planning and specification of the full-scale production equipment. After the execution of significant pilot tests the determination of a performance or process guarantee is normally possible.


              Lab scale candle filter testing at our customers’ facilities represents a win-win situation for both our customers and DrM alike. Bench scale filter testing serves multiple functions. It permits us to show our customers that we can help them achieve their filtration as well as valuable liquid and solid recovery goals. Application process and cost benefits can be projected once repeatable test results have been achieved. It also permits us to prove that scalability is achievable and allows for scientific and reliable sizing of DrM full-scale filtration systems.

              The TSD Lab Filter offers the same features as our full-scale industrial FUNDABAC® candle Filter, but on a bench scale. The unique features of the FUNDABAC® filter element having an outside diameter (OD) of 82 mm at full scale have been scaled down to 30 mm OD. The resulting filter area is 0.012 m2, with special executions installing up to 0.048 m2. The same types of filter media which are used in our industrial scales filter are available for us in the TSD. The filters offer the same functions as our industrial scale units such as filtration, cake washing under pressure, cake discharge as slurry via backwash and dry cake discharge. Using the TSD, our field service technician can demonstrate process concepts to his counterparts who in many cases are chemical engineers and project managers. Our field service representative will demonstrate the optimum manner of cake discharge. Filterability of the liquid can be determined at different cake thicknesses and pressures. Additionally, optimal levels of filter aid precoat and bodyfeed can be determined, if it is determined that these materials are beneficial. Our TSD Lab Filters have built in heating/cooling jackets to further enhance testing flexibility.

              Our laboratory scale filter systems can be used for DrM in-house testing or for rental and testing at client’s site. TSD filters are also available for sale and are a must-have equipment for the laboratory of customers willing to develop new filtration processes or to optimise existing ones.


              Following lab scale testing, some of our clients wish to conduct pilot scale testing at their site to ensure compatibility with actual process conditions. In this case, DrM’s field service representative will work closely with our client’s personnel. Our pilot scale filter units are typically connected directly to the client’s filtration process.

              DrM has a wide range of pilot filters to meet all possible process requirements. Cake washing, slurry or dry cake discharge and Heel Volume Filtration are available as process possibilities on our pilot filters. The available filter area range of these units is from 0.16 m2 to 50 m2 in surface area. Our pilot filters are available in a wide array of materials of construction and are fully equipped, self-standing units either with manual or fully automatic operation with control system. Most are available from our inventory on short notice.

              An air-driven diaphragm pump can be included in the rental unit. The filtrate flow rate must be monitored with a scale or a calibrated drum. In addition, filter cake thickness must be measured and cake samples taken for subsequent moisture assay. The majority of our pilot filters can be operated both as a dry cake FUNDABAC® filter or as a thickened slurry discharge CONTIBAC® filter. For the thickener mode of operation, a conical bottom is used instead of a sliding gate valve. The conical bottom has a ball valve for the concentrated underflow.

              Our pilot scale filter systems are not only available for testing and scale-up purposes. New and used units are also available for purchase for low-volume production scenarios or use at your own testing facility.
          • SPARE PARTS

          • DrM aims to support your business by keeping your DrM filtration systems and vibratory mixers, and by extension your filtration and mixing processes, running. We guarantee the highest quality spare parts and ensure that a comprehensive range of spare parts are available in the shortest delay possible for all FUNDABAC®, CONTIBAC®, STERIBAC® and FUNDAMIX® models. We offer advice on spare parts and on optimizing your filter’s and mixer’s maintenance cycles. This ensures that you get the best possible wear rates from our parts.
                • SPARE PARTS

                • Running the world’s most sophisticated liquid filtration systems and vibratory mixers requires world-class, proactive service and support options. DrM offers a spare parts program that is tailored to our clients’ specific system configurations and is optimized to meet its critical processing requirements.

                  DrM aims to support your business by keeping your DrM filtration systems and vibratory mixers, and by extension your filtration and mixing processes, running. We guarantee the highest quality spare parts and ensure that a comprehensive range of spare parts are available in the shortest delay possible for all FUNDABAC®, CONTIBAC®, STERIBAC®, FUNDAMIX® and Single-Use systems. We offer advice on spare parts and on optimizing your filter’s and mixer’s maintenance cycles. This ensures that you get the best possible wear rates from our parts.

                  We regularly provide two pieces of advice to our clients. Firstly, we recommend that they take a proactive approach to maintenance and operational best practices. Secondly, we encourage our clients to maintain a limited inventory of spare parts at their facilities. Although our facilities are well equipped with many spare parts, there are occasions when unique parts are not readily available. Maintaining a small inventory of unique spare parts can dramatically reduce filter and mixer downtime. Our friendly and knowledgeable customer support personnel are ready to help you. They have the resources and the experience to answer your questions and handle your parts order quickly and efficiently.

                  To communicate with DrM’s Spare Parts Coordinators, please send an email to or visit our Webshop

                  Our goal is to deliver on time every time!

            • Please click on the following tabs to to see a selection of typical processes in which the FUNDABAC® and STERIBAC ® filters and CONTIBAC ® thickener system on one hand, and the FUNDAMIX ® Vibromixer on the other, have proven themselves repeatedly.

                    • OIL & GAS PROCESSING

                      • Crude Oil Mercury Removal: Mercury removal from crude oil to prevent upsets in downstream processes, such as contamination of precious metal hydrogenation catalyst used in catalytic cracking
                      • FCC Catalyst Fines: FCC filtration in flue gas processes
                      • Gas Sweetening: Removal of carbon and FeS scale in amine treatment
                      • MEG Regeneration: Removal of low soluble salts or Hg in MEG regeneration processes
                      • Pigging Water Treatment: Removal of scale originating in pipelines
                      • Produced Water Filtration: Reduction of solids to prevent blocking of wells
                      • Sulfur Recovery: Sulfur removal in redox sulfur recovery processes
                    • BULK CHEMICAL & PETROCHEMICAL

                      • Adipic Acid: Thickening of raw adipic acid suspension in HNO3 prior to centrifugation
                      • Aniline: Catalyst recovery after hydrogenation
                      • Aromatics and Resins: Recovery of hydrogenation catalysts and salts in the production of aromatic amines or resins
                      • Butane Diol (BDO): Catalyst recovery in the production of BDO
                      • Catalyst Recovery: Recovery of precious metal catalysts (Pt, Pd, Rh, Ru) on carbon, Cu catalysts and Raney Nickel after hydrogenation (APP)
                      • Chlor Alkali: Brine polishing, CaSO4 filtration, HgS as well as metallic Hg removal in the chlor alkali industry
                      • Epoxy Production: Removal of NaCl after reaction in the production of high purity epoxy for PCBs
                      • Glycol
                      • Hypochlorites: Removal of iron, nickel and copper from sodium hypochlorite streams (APP)
                      • Lubricants: Wax removal during winterization of lubricants
                      • Olefins: Filtration of byproducts after neutralization in olefin resin production, such as C5 or C9 resins
                      • Oil Additives: Removal of catalysts, bleaching earth or impurities formed after reaction (APP)
                      • Polyols: Removal of salts formed in neutralization (APP)
                      • PPS Production: Removal of salts and other impurities in the production of PPS
                      • Purified Terephtalic Acid (PTA): Recovery of valuable product from waste stream
                      • Rubber Chemicals: Catalyst recovery after hydrogenation
                      • Synthesis Gas
                      • Toluene Diamine (TDA): Catalyst preparation, catalyst recovery and spent catalyst filtration in hydrogenation step (APP)
                    • SPECIALTY & FINE CHEMICAL

                      • Additives: Polishing of reaction solutions, catalyst recovery, decolorization
                      • Adhesives: Clarification of reaction solutions or catalyst recovery
                      • Coatings
                      • Cosmetics
                      • Decolorization: Removal of activated carbon containing adsorbed organic volatiles
                      • Dyestuffs: Recovery of intermediates, clarification of process liquids
                      • Flavors & Fragrances: Catalyst recovery after hydrogenation steps
                      • Pigments: Washing and purification of product, clarification of solutions
                      • Plasticizers: Filtration of crude and clean esters to remove alkaline salts, pigments and activated carbon
                      • Polymers: Clarification of solutions, catalyst removal
                      • Resins: Removal of Ca(OH)2 after product neutralization reactions as well as for the recovery of catalyst after hydrogenation production of C5/C9 petroleum resins
                      • Rubber Vulcanizer: Recovery of noble metal hydrogenation catalyst in the production of PPD
                    • ENVIRONMENTAL

                      • Biodiesel: Removal of impurities downstream of esterification
                      • Carbon Capture & Storage (CCS): Amine filtration in acid gas removal and CO2 sequestration plants, removal of activated carbon containing foaming agents to prevent amine loss and upset conditions
                      • Flue Gas Desulphurization (FGD): Separation of solids such as Me(OH)x or gypsum from flue gas scrubbing plants in power stations
                      • Incineration Waste Gas Treatment: Removal of solid particulate and SO2 in scrubber water (APP)
                      • Quench Water: Removal of carbon, Hg or dioxins from quench water
                      • Recycling: Recovery of products from industrial waste streams for recycling
                      • Solar Cell Production: Filtration of cutting/cooling water as well as removal of spent silicon from thickened slurry
                      • Wastewater: Removal of chemically precipitated toxic substances
                    • FOOD & AGROCHEMICAL

                      • Catalyst Recovery: Recovery of precious metal catalysts (Pt, Pd, Rh, Ru) on carbon and Raney nickel after reaction steps (APP)
                      • Crop Protection Chemicals: Recovery of hydrogenation catalyst in glyphosate production and other agrochemicals. Active carbon removal after decolorization
                      • Fatty Acids: Removal of heterogeneous catalyst after hydrogenation (APP)
                      • Lactose Syrup: Clarification of refined lactose syrup before crystallization
                      • Sugars: Removal of impurities in the production of starch syrup
                      • Sweeteners: Activated carbon filtration after decolorization steps as well as hydrogenation catalyst removal in the production of Sorbitol, Manitol, Xylitol, Aspartame and other sweeteners
                      • Vegetable Oil: Separation of debris, bleaching earth and activated carbon. Recovery of hydrogenation catalyst
                    • MINERAL & METAL PROCESSING

                      • Aluminum Recycling: Removal of salts from High Alumina Secondary Product (HASP) wash water solution
                      • Bauxite and Alumina: Multiple filtration steps
                      • Catalyst Production: Filtration and washing of Ra-Ni after production. Washing of noble metal catalysts during recycling
                      • Leaching: Removal of various impurities after leaching steps
                      • Lithium: Removal of low soluble salts from lithium solution in the production of high purity LiCO3
                      • Nickel Production: Purification of Ni electrolyte upstream of electro-winning
                      • Non-Ferrous Metals: Recovery of non-ferrous metal salts in weak sulfuric acid solution at smelters (APP)
                      • Potassium Nitrate: Removal of salt from potassium nitrate solution ahead of crystallization
                      • Rare Earth: Removal of mineral gangue solids from rare earth element rich liquor
                      • Steel: Filtration of Zn and Sn galvanization as well as phosphatizing bath treatment of pickling acids, filtration of rolling mill oils
                      • Titanium Dioxide: Pre and post-leach filtration. Pigment recovery from Moore filter filtrate as well as from tail gas scrubber acid, gypsum filtration from waste acid neutralization, black liquor filtration, residue leaching, salt separation in weak acid regeneration
                      • Zeolites: Filtration and washing of molecular sieves. Recovery of zeolites and molecular sieve materials after belt and vacuum filters
                    • PHARMACEUTICAL & BIOTECH

                      • Active Pharmaceutical Ingredients
                      • Antibiotics: Filtration of fermentation broths, removal of activated carbon from antibiotic solutions, washing and purification of antibiotic crystals
                      • Catalyst Recovery: Recovery of precious metal catalysts (Pt, Pd, Rh, Ru) on carbon and Raney nickel after reaction steps (APP)
                      • Cell Harvesting: Removal of debris from ruptured cells following fermentation
                      • Decolorization: Removal of activated carbon containing adsorbed organic volatiles
                      • Vaccines and Other Injectables: Filtration of cell debris and active ingredients after fermentation. Mixing of product solution prior to vial filling.
                      • Vitamins: Catalyst recovery, activated carbon removal, salt filtration and polishing of product solutions
                      • X-Ray Contrast agents: Catalyst recovery in the production of contrast agents
                    • ELECTRONICS

                      • Copper Foil Production: Polishing of high purity CuSO4 solution prior electrolysis to produce copper foil for PCBs
                      • Graphite Oxide (GO): Filtration of oxidation agents and GO after reaction with graphite
                      • High Purity Alumina (HPA): Filtration of Al(OH)3 after the purification stage to produce alumina for sapphire production
                      • LCD Production: Removal of sludge from a mixture of very strong acids such as HF and HCl H2SO4 during the etching of LCD glass
                      • Li-Battery Production: Filtration of nano particles in the production of electrodes
                      • Lighting Filtration of halo phosphates
                      • Silane: Filtration of DPR slurries in silane production
                      • Photoresist: Filtration of caustics (NaOH)
                      • Silicon Ingot and Wafer Slicing: Separation of very fine particulate from cooling water
                      • Silicon Wafer Shaping: Filtration of cooling water in backside grinding and sawing processes
                  • VIBROMIXERS

                  • FUNDAMIX® VIBROMIXER

                        • Blood Plasma: Mixing of the fractioning additives to get the most efficient emulsifying effect under sterile conditions
                        • Insulin: Mixing of insulin with low shear force during the crystallisation and filling of ampules
                        • Vaccines: Sterile mixing applications with CIP and SIP
                        • Mammalian Cells: Effective cell growth without cell damage in aneorobic fermentation processes
                        • Tetanus: Degassing of toxic gases from the fermentation process with gas injection
                        • Deaeration of Sterile Liquids: Foam reduced mixing and degassing of sterile liquids under vacuum
                        • FMD Vaccines: Sterile low shear mixing of cell suspensions
                        • Nasal Spray: Mixing of active components with carrier substances under high pressure
                        • Cosmetics: Mixing and emulsification of vegetable fat in the pre-production stage
                        • Contact Lenses: Storage of the base material for plastic contact lenses
                        • Homeopathics: High intensity mixing of ingredients
                      • FOOD AND BEVERAGE INDUSTRY

                        • Fruit Juices: Mixing of fruit pulp without damage or degradation
                        • Bean Curd: Gentle mixing of bean curd agglomerates up to 10 mm prior to filling into cans
                        • Beer Fermentation: Intense mixing of mash with less impact on flavor
                        • Whisky: Mixing that results in the reduction of product aging process
                        • Wine: Mixing of different wines without introducting air with nitrogen blanketing
                        • Flavor: Preparation of flavor suspensions without splashing, eliminating injury risk

                        • Fermentations: Preparation of the fermentation broth under sterile conditions
                        • Algae Growth: Anaerobic fermentation process under sterile conditions
                        • Cell Separation: Separation of living cells from rodent intestines
                        • Nematode Cultivation: Low shear forces prevent damaging of eelworms
                        • Fungus: Cultivation of fungus spores for microbiological production
                      • CHEMICAL INDUSTRY

                        • Crystallization: Mixing with low shear forces to influence crystal growth and morphology
                        • Filter Aid: Mixing of precoat and body-feed suspensions for filtration applications
                        • Plastic Fibres: Suspension preparation of fibres and solvents
                        • Distillation & Hydrogenation: Batch time reduction
                        • Neutralizations: Intense mixing and pH neutralization of waste water
                        • Paper Resin: Quantification of resin concentration
                        • Resuspension: Resuspension of filter cake for suction strainers
                        • Bearing Testing: Lube oil preparation for bearing tests over extended time periods
                        • Toluene: Emulsification of toluene and water
                        • Titanium Dioxide: Suspension preparation with acetone for cigarette filter production
                        • Copper: Dissolving of copper with sulfuric acid under high temperatures under ATEX directives
                        • Chromatography Columns: Packing of chromatographic columns with vibration
                        • Temperature Sensors: Packing of PT100 probes under vibration without air introduction