Unicel C-8409 Replacement Filter Cartridge for 90 Square Foot Hayward CX900RE, Sta-rite PXC-95, Waterway Pro Clean 100, Waterway Clearwater II 100 Diameter: 8 15/16-inch; length: 17 3/8-inch Top end cap: open with molded gasket, 4 0/0-inch inner diameter; bottom end cap: open with molded gasket, 4 0/0-inch inner diameter Pleat count: 174; filter media: 4-ounce reemay 2040; filter area: 90 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications