American Hydro Systems RRC Rid O Calcium and Lime 2X Concentration Stain and Build Up Preventer, 1/2-Gallon Bottle. Rid O Rust RRC Calcium & Lime Stain and Build Up Preventer, 1/2 gallon bottle. RRC keeps drip emitters, spray nozzles and tubing free of calcium ensuring maximum performance. RRC works great in apartment complexes or auto dealerships as it prevents pesky irrigation water spots.For use in the American Hydro Systems injection and siphoning systems to prevent sprinkler stains and mineral build up from well water. The water treatment specialists at Pro Products offer a wide range of solutions that focus on rectifying problems, testing, cleaning stains, and maintaining the performance of water quality equipment.American Hydro Systems RRC Rid O Calcium and Lime, 1/2-Gallon BottlePrevents ugly calcium stains and scaling caused by well waterKeeps drip emitters & spray heads free of build-upPrevents hard water stains on glass & vehiclesNo.1 Selling calcium preventer in the USReady to use formula