Pleatco PWK30-4 Replacement Cartridge for Watkins Hot Spring Spas， 1 Cartridges<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Replacement filter for pool and spa cleaning systems</li><li>50% open ABS free flow cores maximize water flow through REEMAY filter media</li><li>Antimicrobial end caps resist chlorine degradation and provide support to filter material for a longer life span</li><li>10-1/2-by-1-15/16-by-1-15/16-inches</li><li>Made in the USA</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41Qwu7DJwFL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31gEaux4E5L.jpg" noproxy>