This form of iron results in the most complaints and reasons for examination of water for iron content. If allowed to remain in a state with little oxygen present, this type of iron remains in solution and the water will appear colorless. However, in the case of tap water allowed to remain in service lines coming from a well or other source, rust colored iron particles may begin to precipitate out of solution.
These particles obviously ruin water clarity and give the impression of unsafe drinking water. Additionally, they clog certain types of water filtration systems and cause the owners of those water filtration systems to replace them well in advance of their expected replacement dates. Water professionals often refer to this type of iron in water as ‘clear iron’.