A cartridge filter is the final mechanical pretreatment stage upstream of the RO high-pressure pump, typically a 5-µm polypropylene melt-blown depth filter housed in stainless or FRP vessels. Pretreated feed enters the cartridge housing, passes through the depth medium where particles are captured by surface and depth filtration, and exits to the HP pump suction. Cartridges are disposable, replaced when ΔP reaches 1 bar. Cartridges are the last line of defense for the RO membrane against particulate. They also protect the HP pump piston/shoe interface from grit damage. Standard is 5 µm absolute. For high-quality feed, 1 µm. Going below 1 µm raises ΔP and replacement frequency without much SDI improvement. When inlet-outlet ΔP exceeds 1 bar (15 psi), or every 3 months whichever comes first. Heavy organics or biological fouling reduce life sharply. No. Cartridges are polishing filters. They clog quickly on raw water and cannot economically handle the particulate load that multimedia removes. 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.Cartridge Filter
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