What is the difference between ferric iron and ferrous iron?
Ferrous iron – Ferrous iron is often referred to as clear–water iron. …Ferric iron is called red water iron because it gives the water a cloudy reddish/orange appearance. Ferric iron is rust and is the result of oxidizing ferrous iron. This form of iron can be filtered.
Both can be removed by one back washing iron filter called a Terminox® Iron, Sulfur and Manganese filter. This back washing iron filter requires no Salt, chemicals or maintenance of any kind.
You can see it here: Terminox® Iron, Sulfur and Manganese Filter