The process of nanofiltration is a membrane process similar to reverse osmosis. The pore diameters of a nanofiltration membrane are approx. 1-10 nm and the operating pressure with which the water to be treated is forced through the membrane is usually approx. 3 - 20 bar.
Since the retention of the water constituents during nanofiltration is based both on a screening effect and on the repulsion effects of the charged membrane, ionogenic substances can also be removed in addition to the larger viruses and bacteria.
  • Partial desalination, softening
  • Reduction of DOC and germ contamination


Distinguishing between the pressure-driven membrane processes