Persalt nanofiltration elements have high rejection for divalent ions, organics, color, viruses, and bacteria while rejecting less monovalent ions.

PMNF1 and PMNF2 membranes are for softening and applications requiring color and organics removal. The elements have LPD (Low-Pressure-Drop) technology, operate at ultra-low pressures, and do not need frequent cleanings.

Persalt NANO-400SR and NANO-440SR types are membranes for sulfate removal from seawater. Offshore platforms need to inject seawater into the oil wells to increase petroleum production yield. The elements reject 99.8% of sulfate while passing other monovalent ions such as chloride and sodium, which avoids scaling and reservoir souring. Monovalent ions are necessary to maintain clay stability in the wells.