Unicel C-9403 Replacement Filter Cartridge for 150 Square Foot Waterway Clearwater, Rec. Warehouse Diameter: 9 15/16-inch; length: 25 5/16-inch Top end cap: open, 5 13/16-inch inner diameter; bottom end cap: open, 6-1/16-inch inner diameter Pleat count: 218; filter media: 4-ounce reemay 2040; filter area: 150 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications