Because iron bacteria is organic, it is the most difficult form of iron to control. Most often, iron bacteria is removed by using a disinfectant, such as chlorine. An activated carbon filter may be necessary to reduce the amount of chlorine residual in the water. The decaying process of vegetation produces fulvic and humic acids. Iron will react with these acids and form either a soluble or insoluble matter.
Organic iron can be colorless, but is usually yellow or pink in color.
A recommended form of treatment for organic iron is an anion exchange resin. An anion exchange resin unit can be installed with a water softener unit. It is important for the water to be softened first to avoid calcium precipitants. Iron, with its detrimental effects, can be controlled. It is very important to determine the form of iron and its level of concentration before matching equipment for a particular problem.