Nanofiltration is used to remove bacteria, viruses, organic material and hardness from water. Separation process is made on an organic semipermeable membrane. In the process driving force is the pressure difference between feed and permeate side of membrane.

System removes approximately 1 nanometer (10 A^o) sized particles. Typical applications are; removal of color and total organic carbon from surface waters, removal of harness and Radium from well water, in food and wastewater applications separation of organic material from inorganic materials.