Unicel C-5315 Replacement Filter Cartridge for 15 Square Foot Intex B Filter Diameter: 5 3/4-inch; length: 10-inch Top end cap: open, 1 7/8-inch inner diameter; bottom end cap: open, 1 7/8-inch inner diameter Pleat count: 70; filter media: 3-ounce reemay 2033; filter area: 15 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications