Pleatco PWW10PAIR Replacement Cartridge for Waterway Skim Filter 10， 1 Pair<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Replacement cartridge for waterway skim filter 10</li><li>50 Percent 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>Replaces unicel C-4310 and filbur FC-3077; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algae</li><li>Measures 4-1/4-inches in diameter by 4-inches in length and 2-1/16-inches of top and bottom hole diameters</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41N2trgbRqL.jpg" noproxy>