Filtration Systems & Membranes

1. Membrane Technologies: DuPont FilmTec, Toray and MANN+HUMMEL

• DuPont FilmTec RO Membranes: deliver high, stable salt rejection (BW30 PRO-400: 99.6%) and minimum energy consumption in brackish water, seawater, and low-energy reverse osmosis lines.
• Toray RO, NF and UF Membranes: fully aromatic polyamide composite TM-series RO/NF elements alongside hollow fiber (0.01 µm) UF modules; offering high fouling tolerance and FDA Title 21 food/health compliance.
• MANN+HUMMEL UF Modules: PureULTRA II (PVDF) and AQUADYN (PAN) hollow fiber modules provide high flux and long membrane life in water loaded with oil, grease, and suspended solids.

2. Precision Process & Sterile Membrane Cartridges (Chemtech)

• Chemtech CHT Melt-Blown Depth Cartridges: a graded-pore structure spanning 0.5 to 120 microns, 100% pure polypropylene construction, continuous operation up to 82°C, differential pressure rating up to 4 bar (at 40°C), DOE/SOE end-cap configurations, and Ph. Eur / PZH compliance provide high dirt-holding capacity for RO pretreatment and general industrial lines.
• Chemtech POLYFIL PES Sterile Membrane Cartridges: 0.20 micron patented asymmetric polyethersulfone (PES) membrane; inherently hydrophilic with low protein binding and repeatable integrity testing for pharmaceutical, biotech, and beverage filling lines.
• Chemtech TEFPOR GF Air & Gas Micro-Fiberglass Cartridges: hydrophobic PTFE-impregnated borosilicate micro-fiberglass media; 0.2 micron absolute rating with 121°C autoclave and steam-in-place (SIP) sterilization durability for compressed process gas and sterile tank vent lines.
• Chemtech MEGAPLEAT High-Flow Cartridges: 6-inch (152 mm) large-diameter horizontal pleated design reducing cartridge change-out time and housing footprint on high-flow RO pretreatment and cooling water lines.

3. Bag Filters and Sanitary Filter Housings

• Industrial Bag Filters: polypropylene, polyester felt, and welded nylon monofilament bags in the 1–1000 micron range (Size 1 and Size 2); carbon or 304/316L stainless steel housings holding 1 to 24 bags (flow up to ≈ 654 m³/h).
• 316L Sanitary Filter Housings (Chemtech TLSH & LSH): electropolished internal surfaces (Ra < 0.4 µm), Tri-Clamp connections, and jacketed, heated vent/air filter housings meeting pharmaceutical and food industry standards.

Chemtech CHT cartridges are rated for continuous operation up to 82°C and differential pressure up to 4 bar (at 40°C), and are used in chemical, petrochemical, food & beverage, RO pretreatment, and general water treatment applications. They meet the European Pharmacopoeia's filter element requirements and hold a certificate from the Polish National Institute of Hygiene (PZH).

They can be configured to match your existing housing and your process's chemical compatibility requirements, with four end-cap types (DOE, 222/226 flat and fin variants, FC with O-ring, and double open-ended MDOE) and four gasket materials (NBR, EPDM, silicone, and Viton). Equivalent Chemtech polypropylene (PP), PES, PTFE, and micro-fiberglass cartridges can be installed directly into existing standard 10", 20", 30", and 40" DOE and 222/226 O-ring filter housings without housing modification.

For fluids with a high fouling load, we supply industrial bag filter housings and filter bags as an economical solution ahead of, or instead of, cartridge filtration. Standard multi-bag housings are built with a capacity of 1 to 24 bags (flow range approximately 3.4–654 m³/h), in carbon steel, 304, or 316L stainless steel.

Bags are available in a wide range from nominal 1 to 1000 microns, in polypropylene or polyester felt, or welded-seam (no needle holes) nylon monofilament mesh. They are preferred for paint, resin, ink, and coating baths, injection water systems, RO pre-protection, and general process water applications requiring a balance of high flow and low cost.

4. Membrane Degassing (Membrane Contactors): CO₂ and O₂ Removal

Hydrophobic microporous polypropylene hollow fiber membrane contactors bring the liquid and gas phases into direct contact at the membrane pore interface without dispersion, removing dissolved gases in-line under pressure without chemical oxygen scavengers or caustic dosing.

Carbon Dioxide (CO₂) Removal

While reverse osmosis (RO) membranes reject ionic species, dissolved CO₂ gas passes freely through the RO membrane and re-ionizes in water (CO₂ + H₂O ⇌ H₂CO₃ ⇌ H⁺ + HCO₃⁻), raising conductivity. Installed under pressure downstream of RO and upstream of an EDI (electrodeionization) system or mixed-bed ion exchange unit, membrane contactors use air sweep (strip gas) or vacuum on the lumen side to lower dissolved CO₂ below the EDI feed limit. This reduces the anionic load and power consumption on the EDI unit without chemical pH adjustment or by lowering anion-exchange NaOH regeneration demand, improving the removal of weakly ionized species such as silica and boron.

Oxygen (O₂) Removal

In boiler feed water, ultrapure water (semiconductor, power, and pharmaceutical processes), and beverage/process water lines, dissolved oxygen (O₂) causes piping and heat-transfer surface corrosion as well as product oxidation. In a membrane contactor, water flows over the shellside (outside) of the hydrophobic hollow fibers while vacuum, sweep gas (strip gas), or a combination of vacuum and strip gas is applied on the lumenside, achieving trace-level deoxygenation at the outlet. For boiler feedwater monitoring criteria, see our guide on boiler water dissolved oxygen measurement.

Module Supply and Selection

Original or equivalent supply of modules used in industrial membrane contactor lines; selection matched to the system's flow rate, water temperature, operating mode, and target outlet CO₂/O₂ requirement across laboratory, analytical, and industrial/high-purity module size classes.

Membrane Groups

For reverse osmosis (RO), ultrafiltration (UF), and nanofiltration (NF) membranes, we can supply DuPont FilmTec (formerly DOW FilmTec), Toray, and MANN+HUMMEL products matched to the project's flow rate, salt rejection, and fouling profile — these three brands are, based on our long-standing supply experience, among our preferred membrane technologies on our projects.

DuPont FilmTec's brackish water elements (e.g., BW30-PRO-400) provide 99.6% stable salt rejection (minimum 99.4%) under standard test conditions and can operate at pressures up to 600 psi, while its seawater elements (SW30) offer 99.4–99.7% stabilized rejection depending on the model — designed for large-scale industrial and municipal water treatment systems. Toray's RO/NF product range uses a cross-linked, fully aromatic polyamide composite membrane structure; the TM700D series achieves 99.80% nominal salt rejection per element (minimum 99.65%) and a permeate flow of 9.8–45.7 m³/day. Toray also offers, on the UF side, 0.01 micron nominal pore HFUG hollow fiber modules for RO pretreatment and TUF-series sanitary UF membranes compliant with FDA/USDA 3-A sanitation standards. MANN+HUMMEL's UF portfolio includes the PureULTRA II (PVDF hollow fiber, 60–107 m² filtration area) and AQUADYN (PAN hollow fiber, 45–65 m², for oil/grease-loaded water) modules, which — at approximately 0.02–0.03 micron pore size — are used for bacteria, virus, and parasite removal.

The right membrane family and model are engineered based on feedwater analysis, target permeate quality, recovery rate, and the existing system configuration.

Filter Housings

The performance of cartridge, bag, and membrane elements is directly tied to selecting the right filter housing. We offer several housing types matched to your process:

• Cartridge housings (DOE/SOE): DOE (Double Open End) housings are built with a body, cap, cartridge support plate, tie-rods, and a knife-edge sealing arrangement; SOE (Single Open End) housings are built with an outer shell, a perforated-cage-supported filter element, and a positive sealing arrangement — both are available with various end-connection options.
• Sanitary housings: for pharmaceutical, biotech, WFI, and food & beverage applications, in single or multi-round configurations; built with a positioning plate, a gauge port, and a silicone O-ring/gasket.
• Modular housings: a rigid-core design combining the advantages of a closed filter body with depth filter plates; the module is replaced once filter capacity is exhausted and pressure reaches 2–2.5 bar — used for paint, ink, adhesive, and high-viscosity solutions.
• High-flow housings: compact, compression-seal, high-flow-capacity bodies offering a long service life and low operating cost; preferred for RO pretreatment, desalination, and large-volume water treatment lines.
• Jacketed vent/air filter housings: maintain tank/vessel pressure while preserving sterility in fermentation, bioprocess, and product recovery lines; glass-wool insulated, with optional electronically temperature-controlled jacketed designs.

Housing material and connection type are determined by the system's sanitation requirements, the fluid's chemical compatibility, and the existing piping configuration.

Equivalent & Alternative Supply

• Direct supply of DuPont FilmTec and Toray RO membrane elements (we do not recommend RO membranes outside these two brands).
• Hollow-fiber membrane degasser (membrane contactor) modules for dissolved CO₂ and O₂ removal.
• Facilities using different manufacturer process filter housings, depth cartridges, bag filters, and air/gas filters: equivalent / alternative supply via Chemtech (DOE, SOE 222/226) options.
• Sterile membrane filter cartridge users: equivalent supply via Chemtech POLYFIL PES (0.20 micron asymmetric PES) and Tefpor (PTFE) options.