Blitz That Blockage Bathroom One Shot Pack 5 "Blitz bathroom blockage one shot" Mrs Goulding 27 July 2019 Today I used this product. It was amazing but when you add the boiling water to the packet contents the eruption shot up nearly a foot. This I feel should have been added to the directions as dangerous. I hope you can help with this matter and inform the manufacturers accordingly. A note from the team Thanks for your review. We're glad this worked well, but were sorry it shot up - as per the instructions we'd advise rather than boiling water to use hot water which is 70°C to 80°C.