Rid O'Rust is the superior, cost-effective rust preventer for use in American Hydro feeder systems. It neutralizes iron in well water to prevent ugly rust stains on your property, extends the life of your sprinkler components and prevents costly maintenance calls. Rid O' Rust is safe for people, pets and plants when used as directed. In order to determine the proper chemical to use, the well water must be tested for iron content, hardness and pH. In order to determine dosage for a particular application, refer to the on-line dosage calculator. Please note that Rid O'Rust Formulas will not be effective under certain circumstances. Please refer to our warranty statement.