Our toilet cleaning effervescent tablets contain crosslinked carboxymethyl cellulose and peppermint extract. It can be efficiently cleaned, effectively removed and easily decontaminated. Its use method is very simple: 1. After flushing the toilet. 2. Take an effervescent tablet and put it in the tank. 3. Let it sit for a minutes few before it completely dissolves. 4. Press the toilet switch to flush and resume cleaning. And can be deep clean, say goodbye to yellow dirt.