Filbur FC-3915M Antimicrobial Replacement Filter Cartridge for Watkins 30/Hot Spring Microban Pool and Spa Filters<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Microban antimicrobial media</li><li>Reinforced antimicrobial end caps</li><li>Extruded pvc center cores</li><li>Break resistant bands</li><li>Molded in threads， no loose inserts</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51VIET4eMWL.jpg" noproxy>