USED-Intex Krystal Clear Sand Filter Pump 2100 Gallons Keep your above ground pool water clean, soft, and refreshing with the Intex Krystal Clear Sand Filter Pump 2100 Gallons. The sand provides excellent water filtration as the 6-function control valve allows the pool owner to: filter, backwash and rinse, recirculate, drain and close the system. The built in 24-hour timer adds to the hassle-free experience with maintaining a cleaner pool. The strainer basket provides easy-cleaning, and prolongs the life of the sand. The Krystal Clear Sand Filter Pump generates a pump flow rate of 2,100 gallons per hour, ideal for above ground pools. This pump requires virtually no maintenance except replacement of sand every 5 years.