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 Superior fiberglass mineral tank with color choice of white, blue, or blackActivated Carbon MediaGravel under beddingMINERAL TANK COLOR SELECTION:All BASE UNIT part numbers must also include the requested color code to complete.Fill in blank (last missing digit) with either;1 = WHITE 2 = BLUE3 = BLACKSPECIFICATIONS:CF: 6Mineral Tank Size: 21x62Peak (GPM): 55 Range (GPM): 7.2-18Height: 81Shipping (lbs):380