This unique formula prevents the formation of rust and hard water build-up in your toilet bowl and reservoir!
RUSTGuard® contains no acids, caustics, chlorine bleach, phosphates or dyes and won't attack plumbing like chlorine bleach cleaners can!
- Safe on all plumbing and septic systems
- Won't harm pets
100% made in the U.S.A. by Whink Products Company in Eldora, Iowa.