Remove the block from the blister, do not remove wrapper. Flush the toilet system and remove lid. Drop the block with the wrapper into cistern near the float, away from the water inlet (refer to diagram). Replace the cistern and allow some time for the block to settle properly before flushing again. Replace the block when the water loses its blue colour. Do not use in toilets with cracked or damaged toilet bowls.
Irritating to skin and eyes. Avoid contact with the skin and eyes. Risk of serious damage to eyes.