RR2-DR Rid O' Rust Extreme Stain Preventer 2x Problem Well Water Stain Preventer Concentrate for Low pH Conditions REPLACES FORMULA 1000 & 3000 Prevents rust and lime scale staining caused by well-based irrigation 30 Gallon Drum 1- 30 gallon Drum of RR2 is equal to 60 gallons of Formula 1000 1- 30 gallon Drum of RR2 is equal to 60 gallons of Formula 3000