Our three-in-one toilet cleaning block is carefully formulated with sodium bicarbonate and sodium dodecyl sulfate. Designed specifically to assist in softening scale deposits and maintaining the smoothness of ceramic glazes. The usage method is extremely convenient: 1. Tear off the outer packaging bag. 2. Throw the whole piece into the corner of the water tank. 3. Let it stand for 20 minutes before activation. 4. Just flush it as usual. Moreover, it can reduce the unpleasant smell of the flushing water flow and is suitable for scenarios where the water tank is still and releasing water slowly.