Unicel C-7625 Replacement Filter Cartridge for 25 Square Foot American, Swimquip, Premier Diameter: 7-inch; length: 9 13/16-inch Top end cap: open, 3 0/0-inch inner diameter; bottom end cap: open, 3 0/0-inch inner diameter Pleat count: 113; filter media: 6-ounce reemay 2470; filter area: 25 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications