Keep your pool water safe and clean with INTEX Krystal Clear Sand Filter Pump. Sand Filters are one of the most popular ways to keep pool water clean. They can sometimes pick up a lot more of the small algae and dirt particles floating around in your pool. But not only is it effective, it saves on cost and time since the sand needs replacement just once every five years, not every two weeks like a filter cartridge pump. Sand Filters are easy to maintain and a great alternative to keep your pool water sanitized. This sand filter sports a six-function control valve which enables you to filter, backwash, rinse, recirculate, drain and close the system. It includes a 24-hr automatic timer to set the operating time and a safety shut-off to make pool maintenance much simpler. This pump has a flow rate of 2,100 gallons per hour, creating a system flow rate of 1,600 gallons per hour and making it a perfect fit for above ground pools up to 18 feet in diameter (or 24×12 rectangular).