Our toilet cleaner is carefully formulated with sodium bicarbonate and sodium dodecyl sulfate. It is specially designed to clean the inside of the toilet while flushing. The usage method is extremely convenient: the product contains three cleaning blocks. Only one block is needed each time. Place the cleaning block in the designated container (it is recommended to use the original container). After using one, replace it with the next one. Put the container with the cleaning block into the toilet tank and let it sink naturally. Let it sit for about 10 minutes until the cleaning block is completely dissolved and starts working. After each use of the toilet, flush normally to complete the automatic cleaning. Each cleaning block can last approximately 2-3 days, depending on water volume and usage frequency. It can also automatically clean the internal pipes of the toilet, reducing residue build-up.