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"Stops Rust With Every Flush!" This unique formula prevents the formation of rust and hard water build-up in your toilet bowl and reservoir! Each time-released tablet fights rust and hard water stains for 3-6 weeks depending on frequency of flushing, water temperature and water pressure. RUSTGuard® contains no acids, caustics, chlorine bleach, phosphates or dyes and won't attack plumbing like chlorine bleach cleaners can! These tablets won't harm pets, plumbing and septic systems.
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