A nanofiltration (NF) system is a water purification process that uses a semipermeable membrane with pore sizes of about 1–10 nanometers to remove contaminants.It is a pressure-driven process that removes divalent ions (like calcium and magnesium, which cause hardness), dissolved organic matter, pesticides, and microorganisms, while allowing smaller monovalent salts to pass through in limited quantities. NF systems are used for industrial water treatment, softening, and in the food, pharmaceutical, and chemical industries.
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