60Unpleasant taste and odors caused by Iron, Manganese and Hydrogen Sulfide. 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 Greensand Plus MediaSPECIFICATIONS:CF: 2.5Mineral Tank Size: 13"x54"Peak (GPM): 20Range (GPM): 8 Backwash (GPM): 10**Media will be shipped separately to prevent damage when shipped**