Rid-O-Rust Outdoor Rust Preventer, Concentrated Formula, Prevents Stains Caused
Neutralizes iron to prevent unsightly rust on driveways, sidewalks, siding, fences, and more. Designed for water with a pH of 6.0 or greater and any hardness level. This half-gallon bottle will treat up to 125,000 gallons of water with 1 ppm iron.