Pleatco for Mytilus-B 60 GPM MY 60, Mitra 60 GPM MA-60/160, Mytilus 60 60 GPM MY 60, Mytilus-B 140 GPM MY 140, Wet Institute Modufilter M-180 Replacement filter for pool and spa cleaning systems 50% open ABS free flow cores maximize water flow through REEMAY filter media; Microban inhibits the growth of stain and odor causing microbes like bacteria and algea Antimicrobial end caps resist chlorine degradation and provide support to filter material for a longer life span 14-1/16-by-3-1/16-by-3-1/16-inches 2 or 3 catridges required for some models of filters