Membrane fouling is the gradual deposition of particulates, biological matter, organics, or inorganic precipitates on the RO membrane surface, raising operating pressure and dropping permeate flow over time. Fouling manifests as: rising feed-to-concentrate differential pressure, declining normalized permeate flow, and (for some foulants) rising permeate TDS. Diagnosis requires autopsy of representative elements. Fouling drives every recurring cost in an RO plant — chemical cleaning labor, lost production during CIP, eventual element replacement. Good pretreatment design prevents 80%+ of fouling. Particulate (mud, silt), biological (biofilm, bacteria), organic (NOM, oil), and inorganic scale (CaCO₃, sulfates, silica, iron). Industry rule: clean when normalized differential pressure rises 15%, or normalized permeate flow drops 10%, or salt passage rises 10–15% from baseline. Particulate, organic, and biological fouling are mostly reversible by CIP. Inorganic scale is partially reversible. Membrane oxidation is permanent. 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.Membrane Fouling
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