Sta-Rite System 3 Replacement Large Cartridge Element S7M120 21"

The Sta-Rite Replacement S7M400 Cartridge is designed exclusively for System 3 filters. Made from ultra-porous polyester pleats, Sta-Rite replacement cartridges work to purify pools and spas with crystal clear results and can be easily cleaned with any standard garden hose. Installation is easy and convenient, requiring seven clamps and bolts to secure the cartridge in place for dependable service.

Fits Modular Media 400 System 3
Inner Cartridge
Square Feet: 200