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Pentair System:3 S7M120 Large Outer Sediment Filter Cartridge - 200 Square Feet pipe-size_1/4" This is a 15 GallonThe Pentair 25022 0201S Cartridge Filter Element for System 3 S7M120 Filters has a media area of 200 Square Feet and is made of superior reinforced polyester pleated material with polyurethane end caps. Pentair reusable cartridge filter elements provide a high degree of water clarity and longer filter cycles. To maintain your pool water cleanliness and clarity, Pentair genuine replacement cartridge elements are the number one choice in cartridge