Unpleasant 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: 1.0Mineral Tank Size: 9"x48"Peak (GPM): 18Range (GPM): 5 Backwash (GPM): 7**Media may be shipped separately to prevent damage when shipped**