Clearing blocked toilet with caustic soda

Timothy Murphy · 2004-07-21T23:01:11+00:00

My first-floor toilet is blocked, as far as I can seejust after the U-bend.My local plumbers merchant gave me a jar of sodium hydroxide,and told me this was as good as anything.The label on the container warns me to follow the instructions carefully,but unfortunately the instructions are missing.Can I safely pour some down the toilet?Do I have to ensure it will get round the U-bend?Any advice or suggestions gratefully received.