Unicel C-6430 Replacement Filter Cartridge for 30 Square Foot Hot Springs Spas/Watkins Mfg<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Diameter: 6-inch; length: 10 1/2-inch</li><li>Top end cap: open， 1 15/16-inch inner diameter; bottom end cap: open， 1 15/16-inch inner diameter</li><li>Pleat count: 124; filter media: 4-ounce reemay 2040; filter area: 30 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/41wQM3zQGML.jpg" noproxy>