20 Pc Automatic Bleach Toilet Discs Bowl Flush Cleaner Stain Remover Tablet Tank !! These long lasting automatic bowl cleaning discs clean and deodorize with every flush. Each tablet measures 2" diameter approx and are safe for all plumbing and septic tanks. It cleans the tank, rim, inner wall, water pipe and other parts of the toiler thoroughly and make your toilet bowl clean and bright, safe for use with bleaches and cleaners.These tablets are effective in deodorization, purify the air of the toilet. Easy to use: just take out 1 cleaner, put in the far end of the tank from water outlet. This listing is for 20 pieces (10 packs).