Emerging filtration approach

Surface water is a critical resource to meet the world's increasing water demands. However, water drawn from rivers, lakes, ponds, and streams can contain bacteria, parasites, viruses, and other potential contaminants from rainfall and runoff.

Pentair developed hollow fiber nanofiltration technology that makes it possible for you to:

  • remove micobiology and dissolved organics from surface water
  • apply a sustainable and environmental safe solution
  • help decrease the use of chemicals and energy that is required to treat your surface water
  • reduce organic impurities that cause color, odor, and bad taste

As the wastewater from hollow fiber nanofiltration does not contain chemicals or increase in minerals, it can potentially be returned to the environment without further treatment.

Typical applications

  • Where sustainable operation with very low environmental impact is required
  • Relatively small-scale operations in remote locations with NOM and color issues  
  • Tourist locations with seasonal occupation, such as visitor centers 
  • Water plants without operating personnel that require a high degree of automation 


When do you choose hfnano?

  • Feedwater color: up to 100 Hazen units 
  • Feedwater TOC (Total Organic Carbon): up to 50 mg/l 
  • Low salinity, low hardness 
  • Microbiological contamination requiring multiple barriers (e.g. combining NF with UV and chlorine)

While the above is a good indication of surface water conditions that warrant the choice for HF Nano, the ideal solution is determined by your site-specific conditions and your water quality. In general, flow demand and the availability of proper sludge discharge facilities drive the choice between coagulation/ultrafiltration and nanofiltration.

HFW1000 Membrane element

The key features of our Pentair X-Flow HFW1000 Membrane Elements:

  • High removal of organic matter1
  • Certified for bacteria and viruses: 4-log (99,99 percent)2
  • Hydrophilic membrane composed of (modified) PES (high performance and superb antifouling behavior)
  • Highly asymmetric/microporous structure
  • Typical permeate quality:5 SDI < 3, turbidity <0.1NTU
  • Online integrity testing
  • Simple pretreatment with strainer
  • 1 Aggarwal, Rahul. “Strategic Assessment of Drinking Water Production Systems Environmental Impacts from a Life Cycle Perspective: A Case Study of Norrvatten Future Drinking Water Production Alternatives. ” DIVA, KTH ROYAL INSTITUTE OF TECHNOLOGY, 11 Dec. 2020, urn.kb.se/resolve?urn=urn%3Anbn%3Ase%3Akth%3Adiva-287466.
    2 Registered at nsf.org as Nanofiltration device, HFW1000. Certified by NSF for Cryptosporidium removal efficiency, with a mean log removal value of 6.32 log, and minimum LRV of 5.75 log. The maximum certified filtration flux rate is 23.5 gfd. Also tested for virus removal efficiency, with a mean LRV of 5.54 and a minimum of 5.44 log.

    the crucial advantages of pentair x-flow hfw1000

    The innovative Pentair X-Flow HFW1000 Membrane Element offers the combination of high chemical resistance with hollow-fiber technology and the superior performance of nanofiltration in retaining dissolved organic matter. 

    Rely on the robust X-Flow HFW1000 Membrane Element that is easy to clean by reversing the flow and with aqueous chlorine solutions. Feel confident knowing the effluent is free of chemicals. The hollow-fiber technology delivers an excellent permeate quality and allows for integrity testing while in operation. 

    The integration of X-Flow HFW1000 Membrane Elements in the X-Flow HFNano Solution makes for a straightforward production process. No coagulation means no waste generated by sludge and chemicals, and no disposal and transport issues. Communities in remote areas can benefit from a simple, robust, safe, and reliable system to produce drinking water.

    case study taswater


    Nanofiltration applied in Australia. At this water treatment plant we did a pilot test with our Pentair X-Flow HFW1000 Membrane Elements.

    case study delco


    A 12-month pilot in Canada with two nanofiltration skids equipped with Pentair X-Flow HW1000 Membrane Elements. 


    on-demand webinar

    Our experts Frans Knops and Jens Potreck compared 8 possible solutions for removing Natural Organic Matter (NOM) from surface water.



    Learn more about the features and specifiations of our pre-engineered and fully functional X-Flow HFNano Unit.



    Discovering what you and your customers strive for –  a chemical free water treatment with one-step nanofiltration.



    Read the research of R. Aggarwal in which he  researched on 9 alternatives for a plant in Sweden. 


    Understand how our Pentair X-Flow HFNANO Solution can work for you.

    Please contact us if you are interested to know more about our Pentair X-Flow HFNANO Solution. Fill in this form and we will contact you as soon as possible.


    By submitting your information, you confirm that you agree to the storing and processing of your personal information by X-Flow as described in the Privacy Notice. We will only use this information to respond to your request.