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America’s Authority in Membrane Treatment Nanofiltration and Reverse Osmosis (NF/RO) Reverse osmosis (RO) is a physical separation process in which properly pretreated source water is delivered at moderate pressures against a semipermeable membrane. The membrane rejects most solute ions and molecules, while allowing water of
Reverse osmosis vs nanofiltration is a hotly debated subject in the water treatment industry. Supporters of both membrane filtration technology have continued to highlight the advantages of each water purification system that makes them the better of the two. RO and NF systems share similarities in terms of appearance and features.