Pentair System 3 S7M120 Filter Cartridge Kit – 300 Sq FtRestore Maximum Filtration Performance to Your Pentair System 3 Filter The Pentair System 3 S7M120 Filter Cartridge Kit is a genuine OEM replacement cartridge set engineered to fully restore the filtration performance of Pentair System 3 modular media filters. Designed for systems rated at 300 square feet of total filtration, this complete kit includes both the inner and outer cartridges, ensuring balanced flow, superior debris capture, and long