Iron accounts for approximately 4.1% of the earth's crust and generally is found in some degree in most water supplies. When your beverages taste metallic or your bath water is murky and discolored, you most likely should have your water tested for iron. Aqua-Pure iron-removal softeners are installed where the pipes enter your house and are used to remove iron (red/brown stains), manganese (grey/black stains), and hardness minerals (scale and soap curds).