The Clean & Clear RP Cartridge Filter delivers top-of-the-line cartridge performance to keep pools sparkling clear, trapping particles as small as 20 microns (an average grain of sand is 1,000 microns). The new side entry design optimizes flow for nearly 50 percent greater efficiency than any other single cartridge filter on the market, earning it the Pentair Eco Select Brand for our most environmentally responsible equipment choices. Thanks to its one piece polypropylene tank, cleaning the cartridge is a simple task. Simply pop off the top and hose down the cartridge. The RP series is available in 100, 150, and 200 sqft sizes.