Unicel C-5626 Replacement Filter Cartridge for 25 Square Foot Marquis Spas， Old<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Diameter: 5 3/16-inch; length: 11 7/8-inch</li><li>Top end cap: open， 1-1/16-inch inner diameter; bottom end cap: open， 1 5/8-inch inner diameter</li><li>Pleat count: 115; filter media: 4-ounce reemay 2040; filter area: 25 square feet</li><li>Get more efficient filtration and better water clarity with Unicel filters</li><li>Longer time between cleanings; meets oem specifications</li></ul></div><img src="http://ecx.images-amazon.com/images/I/412y3p%2BwhVL.jpg" noproxy>