An iron removal filter is a specialized water treatment system designed to extract dissolved iron and other related contaminants from your water supply. For many households, especially those relying on well water, this is an essential system Most effective iron filters utilize a process known as oxidation. In this process, dissolved iron that you can’t see is transformed into solid, rust-like particles. The system’s internal filter media then traps these solid particles, allowing clean, clear water to flow out–.