*Rarely does water from a city water system require an iron filter. 

If you have a well, there are four primary types of iron we deal with in our area. First is ferrous clear water iron. You can smell it, taste it, even feel it but you can’t see it (we call it in solution). Ferrous iron can only be filtered out through ion exchange in a water softener.

However, too much iron will destroy a water softener.  Therefore, we use air oxidation techniques to convert ferrous iron to the second type, ferric which is oxidized iron. If you leave a glass with ferrous iron in it overnight, it will turn to ferric just from the air oxidizing it. The iron turns orange. Once the iron is oxidized, it can be removed mechanically with certain types of sand, zeolite crystals and other speciality medias that help filter pure water.