In addition to hard water, many homeowners struggle with iron in their water supply. Iron can be found in city water supplies and in private wells. Rust stains, where there has been water, are a good indication that you have iron in your water supply. Iron Fighter Water Softener Pellets are specially formulated for water with high iron content. These 99.6% pure water softener salt pellets help prevent rust stains on laundry, fixtures,.. See full description for further details