Whink 20621 Rustguard 6 tablet box

RUSTGUARD stops rust with every flush. 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.