S7M120 System 3 Inner Pool Filter Compatible with 25021-0200S & 25022-0201S, Replacement for Sta-Rite System 3, SR300 Pool Filter Cartridge, 100 Sq.Ft. Filtration AreaREPLACEMENT FILTER Inner Filter: Replaces 25021 0200S (S7M120) 25021 0200, 25021 0200S. SIZE Inner Filter: Length: 25 1 4", outside diameter: 8 3 4", filtration area: 100 sq. ft. SUPERIOR FILTRATION Our advanced point bond media has tighter filtration capabilities compared to trilobal media material or classic non woven filter media. That means a superior filtration of biomass, dirt, debris, hair, leaves and critters to help keep your pool or spa