Detailed Product Description 1.durability: it can flush for 250 times when the water is below 25C; 2. excellent cleaning ability : it can clean the dirty both of the tank, rim, inner wall, water pipe and other parts of the toiler thoroughly; 3. acute sterilization ability: effective in killing bacteria and germs of the toilet and sewer pipe, preventing bacteria from toilet and toiler sewer infected alternately 4.fragrance: be effective in deodorization, and keep perfume continuously, purify the air of the toilet: 5.safety: neutral product , without any causticity or toxicity 6. Environment-protection: no phosphor and without heavy metal: 7. excellent blue that makes you fell comfortable. 1) Clean the toilet bowl thoroughly. 2) Remove the cistern cover. Drop the block to the bottom of the cistern with two sides against the cistern wall near the float, but away from the water inlet and keep it still, in order to ensure it long-lasting. 3) Add a new BLUE BUBBLE when the blue color of flushing water disappears. Caution 1) Irritating to the eyes and skin 2) Avoid all contact with the contents 3) In case of contact with skin, wash immediately with plenty of water 4) In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 5) If swallowed seek medical advice immediately. 6) Keep out of reach of children.