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Water Filtration Products Legacy Drop-In Style Replacement Cartridge 5250 Grains^ Water Filtration Products Legacy Drop-In Style Replacement Cartridge, Model: CFS5400-C CUNO, Cation Exchange, CFS Series, Flow rate: 1.0 gpm, Micron Rating: 5, Pressure range: 125 psi, Capacity: 5250 Grains