Usage instructions:
Use only as directed. Do not use in porous or cracked cisterns. Safe to use with septic tanks. Directions for use: 1. Clean the toilet thoroughly, including under the rim. 2. Flush thoroughly and remove the block from the pack. 3. Drop the block into the cistern by the float, at the opposite end to the water inlet (see diagram). 4. Allow 5 minutes for the block to settle before flushing. 5. When colour fades, open cistern and use a brush to remove all traces of block. Replace with Jeyes toilet block to ensure your toilet remains fresh and clean.

Ingredients:
Contains amongst other ingredients: Range - Ingredients. Greater than 30% - Anionic Surfactant. 0.2% - Preservative.