Nanofiltration uses membranes with ~1 nm pores at 5–15 bar to reject 80–95% of divalent ions (Ca²⁺, Mg²⁺, SO₄²⁻) while passing most monovalent salts. NF is the standard technology for water softening and selective rejection. NF membranes look structurally similar to RO but with looser polyamide chemistry. Pressure-driven flow rejects larger and charged species while monovalents pass with most of the water. NF softens water at lower energy than RO and produces a less-mineralized permeate well-suited to municipal drinking-water polishing where TDS is not a concern. No — NF passes too much monovalent salt to make seawater potable. NF is for softening and selective removal, not desalination. Typically 5–15 bar — about 30–50% of BWRO pressure for the same recovery. Hardness removal, color removal from surface water, sulfate removal for oilfield injection, partial demineralization for beverage water. ForeverPure has supplied desalination, high-pressure pumps, and energy-recovery devices to commercial and industrial customers since 2003. Contact our engineers for sizing, quotes, or technical support.Nanofiltration (NF)
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