The CLX-C1100-MB Replacement Pool and Spa Filter fits the Hayward C-1100 filter housing. CloroxTM Pool & Spa Platinum Edition Premium Pool Filters are manufactured with new meltblown technology that revolutionizes the pool filter industry. Meltblown pool filters offer enhanced circulation improving the suction and surface skimming action of your filter. They also offer superior filtration by filtering particles all the way down to 3-5 microns in size to give you crystal clear water. On top of providing the best filtration on the market the meltblown construction of the filters utilizes depth filtration to provide maximum dirt holding capacity. Freeing you from the monthly chore of filter cleaning so you can spend less time maintaining your pool and more time enjoying it. Upgrade your pool experience today with new technology from a brand you trust.