"The American Hydro Systems RR1-2.5 is the 2.5 gallon container size option of the RR1 Rid O' Rust 2X Concentrate Rust Preventer. The RR1 is formulated to be twice as strong as the original and is made for use in American Hydro feeder systems. Once added in your system, the preventer works to neutralize the iron in the well water to stave off costly rust stains from forming on your property from fences to sidewalks to more. The RR1 should be used in place of Formula 500 and Formula 2000 and is made for use with any hardness of well water with pH 6 or greater. With this 2.5-gallon container you will get 625,000 gallons of treated well water with 1 ppm iron. Professional grade and safe for people, plants, and pets when used as directed. Order today!"