Enjoy clean water from every faucet at home. ISPRING WCFM400K removes iron and manganese from your water efficiently and effectively. The system uses air injection with advanced catalytic media to remove iron and manganese from the water. During the backwash process, the system introduces fresh air into the top of the tank. As the water passes through the pocket, it is infused with the oxygen in the fresh air, and the advanced catalytic media is a catalyst between the iron, manganese and the air. The oxidation process is almost instantaneous; the iron and manganese precipitate and are trapped by the media bed. The system's electronic control valve automatically backwashes the system to clean the filter media and flush the precipitated iron and manganese down to the drain. The filter media inside of the WCFM400K acts as an insoluble catalyst to enhance the reaction between dissolved oxygen (D.O.) and iron compounds. The dissolved iron is usually in the ferrous bicarbonate state in ground waters due to exceeding free carbon dioxide and is not filterable. The filter media, acting as a catalyst between the oxygen and the soluble iron compounds, enhances the oxidation reaction of Fe2+ to Fe3+ and produces ferric hydroxide, which precipitates and may be easily filtered. The media is not consumed in the iron removal operation and therefore offers a tremendous economic advantage over many other iron removal methods.