Our toilet decontamination tablets contain sodium bicarbonate and citric acid. It can quickly remove stubborn stains and keep the toilet as clean as new. Eliminate odors, kill bacteria, and ensure fresh and healthy bathroom air. Its use method is very simple: 1. After flushing the toilet, take out a piece of this product into the toilet tank. 2. Let it sit for a few minutes to dissolve completely. 3. Press the toilet switch to flush. It contains bleaching ingredients to keep the toilet shiny and reduce residual dirt.