Membrane

Blocking large divalent salts

Large pore size

PurePro® RO system (with NF membrane) is designed for the people who still want to keep the natural mineral element inside the water. Nanofiltration membrane has a slightly larger pore size (0.0008 microns)than reverse osmosis membrane. Thus monovalent salts like sodium chloride (common table salt) molecules passes through the membrane but large divalent salts of calcium, magnesium and other metals like iron, heavy metals..etc. are all blocked.The pore size of RO membrane is 0.0001 microns which is smaller than the size of the Sodium Chloride Molecule which is 0.0007 micron and will not let it through. Nor will it let through germs and viruses, and organic molecules which are very much larger than the RO pore.