Unicel C-8425 Replacement Filter Cartridge for 250 Square Foot Jandy CS250 Diameter: 8 15/16-inch; length: 33 1/8-inch Top end cap: open, 4 0/0-inch inner diameter; bottom end cap: open, 4 0/0-inch inner diameter Pleat count: 250; filter media: 4-ounce reemay 2040; filter area: 250 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications