Nanofiltration (NF) is a membrane liquid-separation technology sharing many characteristics with reverse osmosis (RO). Unlike RO, which has high rejection of virtually all dissolved solutes, NF provides high rejection of multivalent ions, such as calcium, and low rejection of monovalent ions, such as chloride.


With respect to the size and weight of solutes that nanofiltration membranes reject, NF operates in the realm between reverse osmosis (RO) and ultrafiltration (UF): Organic molecules with molecular weights greater than 200 – 400 are rejected. Nanofiltration membranes can effectively reject, among other contaminants:

  • Dissolved organics.
  • Endotoxins/pyrogens.
  • Insecticides/pesticides.
  • Herbicides.
  • Antibiotics.
  • Nitrates.
  • Sugars.
  • Latex emulsions.
  • Metal ions.


  • Good Organic (NOM) Removal
  • Partial Softening Preserves Water Character
  • Reduced Power Consumption and Costs
  • Long Element Life
  • Delivers high productivity due to high active area
  • High cleanability due to wide cleaning pH range (1 – 12) tolerance

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