PACK OF 12 - Whink Rust Guard 2 in 1 Hard Water & Rust Toilet Bowl Cleaner - 2 CT

Use to prevent the buildup of rust and hard water stains in toilet bowls and reservoirs 2-in-1 formula contains no chlorine bleach, phosphates, dyes, caustics or acids Simply place one tablet inside of the toilet tank to prevent rust stains Safe for use in all septic systems, plumbing and colored toilet bowls Tablet dissolves into thick gel in tank and continues working for up to a monthYou may also like 120 X Automatic Bleach Toilet Bowl Cleaner Stain Remover Blue Tablet Flush Tank.