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X-Flow’s HFW1000 is a chlorine-tolerant nanofiltration membrane element widely used in the production of process and potable water. This innovative membrane element combines the high chemical resistance of X-Flow membranes with hollow-fiber technology and the superior properties of spiral-wound nanofiltration in the retention of dissolved organic matter. Typical applications are the filtration of surface water and WWTP effluent for the removal of color components, such as humic or fulvic acids, often in combination with the Pentair X-Flow HFNANO Solution.




  • Excellent removal of organic matter
  • Removal of microorganisms
    - Membrane filtration provides 99.9999% reduction of bacteria and 99.99% reduction of viruses by mechanical means
  • Chlorine-resistant nanofiltration due to hollow-fiber technology
  • Hydrophilic membrane composed of (modified) polyethersulfone  (high performance and superb antifouling behavior)
  • Highly asymmetric/microporous structure
  • MWCO: 1,000 Da (Dextrane)
  • Typical permeate quality:
    • SDI < 3
    • Turbidity <0.1NTU
  • Designed for color removal; typical membrane retention of > 90% (Pt-Co)
  • Minimal salt rejection to maintain salt balance
  • Online integrity testing
  • Backwashable, easy to flush
  • Simple pretreatment

Functional Description

The HFW1000 removes dissolved organics

The X-Flow HFW1000 Membrane Elements are operated vertically. The membrane elements are operated with crossflow (feed- and-bleed).

Click here to learn more about this connection configuration.

Pentair X-Flow Vertical-Crossflow-NF

Fields of application

The HFW1000 is highly effective in the removal of natural organic matter (NOM) with limited reduction of bivalent salts (e.g. hardness). With these characteristics, the HFW1000 is extremely suitable for the production of potable water from surface water, without the need for remineralization. The hollow fiber nanofiltration membranes require no pretreatment other than a strainer.

The integration of the HFW1000 membrane with the Pentair X-Flow HFNANO Solution in the pretreatment for potable water allows for a simplified process. Skipping the coagulation step means reducing waste and the use of chemicals. Furthermore, as organic matter is removed more effectively,  the GAC (granulated active carbon) regeneration interval can be decreased. These advantages were demonstrated in several case studies and pilot projects.
Other typical applications are the filtration of industrial wastewater treatment effluent (e.g. textile effluent) and process water production.

The HFW1000 membrane modules provide communities in remote areas with a simple, robust, safe, and reliable system to produce potable water without the need for transportation of large amounts of chemicals and waste.



Membrane surface area
40 m²
Module dimensions (dxl)
200 x 1537.5 mm
Housing material
PVC white
Membrane material
PES modified/PES
Hydraulic membrane diameter
0.8 mm
Nominal pore size
MWCO 1000 Da
During filtration: 3 < pH < 10. During cleaning: 2 < pH < 11
Chlorine resistance
Cumulative: 100 000 ppm hours. Cleaning: 200 ppm at ≤ 40°C, pH ≥ 10

Featured cases


River water