Compatible replacement for Unicel UHD-SR70, Pleatco PSR70-4, and Filbur FC-2540 Made in the USA Clorox Pool & Spa Platinum Edition filters feature a new innovatie meltblown construction that provides numerous benefits to traditional pleated pool filters. Meltblown filters offer improved filtration down to 3-5 microns compared to 10-15 microns for traditional pleated cartridges providing superior water clarity. Maximum dirt holding capacity from the layered depth filtration of meltblown cartridges allows the filters to hold more dirt and debris eliminating the need for monthly washing and cleaning. Enhanced flow from less back pressure on the filter system improves suction / surface skimming action, improves return flow, provides overall improved circulation and chemical distribution. The CLX-SR70-MB Replacement Pool and Spa Filter fits the Sta-Rite Posi-Flo T-70TX 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.