Unicel C-7451 Replacement Filter Cartridge for 50 Square Foot Caldera Spas<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Diameter: 7-inch; length: 10 3/4-inch</li><li>Top end cap: semi-circular handle， 0-inch inner diameter; bottom end cap: 2-inch male slip fitting， 0-inch inner diameter</li><li>Pleat count: 200; filter media: 3-ounce reemay 2033; filter area: 50 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/417kveMr-wL.jpg" noproxy>