This Sta-Rite replacement filter cartridge kit is designed for the System 3 S7M120 Modular Media Filter. Because of its large 300 square foot filter area, the S7M120 Filter houses one smaller inner cartridge (100 square foot) and one larger outer cartridge (200 square foot). This kit includes one small and one large replacement cartridge. Easy to clean and simple to replace, the Replacement Filter Cartridge Kit is efficient at capturing fine debris, leaving you with clearer, cleaner pool water.
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