Unicel C-7303 Replacement Filter Cartridge for 150 Square Foot Advantage Mfg Diameter: 7 1/4-inch; length: 28 13/16-inch Top end cap: open with step, 2 15/16-inch inner diameter; bottom end cap: open with step, 2 15/16-inch inner diameter Pleat count: 189; filter media: 3-ounce reemay 2033; filter area: 150 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications