Unpleasant taste and odors caused by chlorine or organic substances such as decayed vegetation and run-off are adsorbed by top quality activated carbon. The filter will automatically backwash to a predetermined schedule using a calendar clock controlled valve. This frees the bed of accumulated impurities and reads it for operation again.FEATURES Simple and dependable High flow control valve is fully automatic and keeps media lofted and clean User friendly and easy to program Non-corrosive, UV resistant Noryl valve body Flow rate up to 20 GPM Includes 3/4" or 1" by-pass valve Includes a five year warranty SPECIFICATIONS:CF: 2.0Mineral Tank Size: 12x52Peak (GPM): 10Range (GPM): 1.9-5