Unicel C-9421 Replacement Filter Cartridge for 200 Square Foot Jandy CJ 200 Diameter: 10 5/8-inch; length: 28-inch Top end cap: open with step, 5 15/16-inch inner diameter; bottom end cap: open with step, 5 15/16-inch inner diameter Pleat count: 254; filter media: 4-ounce reemay 2040; filter area: 200 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications