Which statement about iron problems in water treatment is true?

The statement that treatment depends on the source of the iron is accurate because different types of iron present in water may require distinct treatment methods based on their oxidation state and the specific challenges they pose. Iron commonly exists in water in two forms: ferrous (dissolved, Fe²⁺) and ferric (particulate, Fe³⁺).

When dealing with ferrous iron, methods such as oxidation followed by filtration are typically employed to convert it into a solid state that can be removed from the water. This contrasts with ferric iron, which may only require filtration to remove the particulates. Additionally, the presence of other factors, such as water pH, the presence of organic material, and the concentration of iron, also influence the treatment strategy. Thus, understanding the source and form of iron is crucial for effectively addressing iron-related water quality issues.