Birm is a manganese oxide which is a chemical free water treatment method to remove Iron, and Manganese. 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 Filox MediaSPECIFICATIONS:CF: 2.0Mineral Tank Size: 12"x52"Peak (GPM): 15-20Range (GPM): 7 Backwash (GPM): 7**Media will be shipped separately to prevent damage when shipped**