Our toilet scale remover is carefully formulated with sodium bicarbonate and sodium dodecyl sulfate. Designed specifically for automatically cleaning the internal pipes of toilets， reducing dirt residue， helping to suppress odors， and keeping the toilet fresh. The usage method is extremely convenient: 1. This product contains three cleaning blocks. Just put in one each time. 2. Put the container with the cleaning block into the toilet tank and let it sink. Let it stand for about 10 minutes until the cleaning block is completely dissolved and you can start working. 4. After each use of the toilet， flush it normally to complete the cleaning. Each cleaning block can be used for approximately 2 to 3 days， with the exact duration varying slightly depending on the amount of water used and the frequency of use. Moreover， it can help remove scale and urine stains， extend the service life of the toilet， make daily use convenient and effortless， and reduce the frequency of scrubbing.