In what type of water are red staining problems from iron likely to occur?

Red staining problems from iron are most commonly associated with corrosive water. Corrosive water tends to have a lower pH and higher levels of dissolved oxygen, which can contribute to the leaching of iron from pipes and plumbing fixtures into the water supply. As this iron oxidizes, it can leave behind red or rust-colored stains on sink surfaces, laundry, and plumbing fixtures.

Corrosive water can dissolve minerals and metals more readily than non-corrosive water, exacerbating the problem of iron staining. This is particularly concerning in areas where old iron pipes are in use, as the corrosive nature of the water can increase the rate at which iron is released into the system. Knowing how water chemistry influences staining is essential for effective water treatment and mitigation strategies.

In comparison, while the other water types listed may also contain iron, they do not typically contribute to red staining in the same prominent way as corrosive water. For instance, hard water may contain high levels of minerals, including calcium and magnesium, but it does not exhibit the same corrosive characteristics that enhance iron leaching.