12PCS toilet Bowl Cleaner Tablets Automatic Tank Drop-In Fresheners Stain Removal and Limescale Prevention with Long-Lasting Deodorizer Features: 12-week continuous clean – slow-dissolving releases active enzymes with every ; prevents buildup before it starts. -action – lifts stubborn stains, dissolves hard water rings & eliminates urine odors in one cycle. Tank-safe – non-, non-corrosive tablets rubber flappers, metal chains & plastic components; septic system friendly. Mess-free drop-in use – individually wrapped tablets drop directly in tank; no scrubbing, no measuring, no gloves needed. -fresh upgrade – crisp neutralizes bathroom odors; leaves bowl water sparkling clean & subtly perfumed. Product Description: Contains: 12x cleaning tablets Ingredients: sodium percarbonate, sodium bicarbonate, polyethylene glycol-400, citric , sodium dodecyl benzene sulfonate