The water flows through a highly oxygenated media and the oxygen charge burns the dissolved metallic salts such as iron. As the iron is burned and turned to ash, the water continues through the media and the debris is then filtered out of the water. One of the differences between iron filters and iron filter pricing is flow rates. The lower the flow, rate the lower the cost of the iron filter. It is imperative to make sure you get an adequate flow rate with your equipment.