For your safety, read label and accompanying MSDS before using.
Most natural waters contain some iron.
Its presence may vary from small traces to very large amounts in water which is contaminated by acid mine wastes. For domestic use the concentration should not exceed 0.2 ppm and for some industrial applications not even a trace of iron can be tolerated. There are many means available for removing or reducing the iron content. Water softening resins are effective for removing small amounts of iron and special ion exchange materials are selective for iron removal. High concentrations of iron can be removed by such chemical processes as oxidation and lime or lime-soda softening.