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. FEATURESElectrical: 110 V/60Hz standard (all valves)Clock initiated Activated Carbon MediaGravel under beddingSPECIFICATIONS:CF: 1Mineral Tank Size: 9x48Peak (GPM): 10Range (GPM):  1.3-3Height: 61Shipping (lbs): 60