Recent content by nph

Thanks for reply but already tried that and makes no difference. PS think you mean 10mm not 10cm!

Have now changed waste pipe to 110mm OD UPVC pipe but has made no difference. Old pipe was actually nearer 3.5" (90-95mm OD). Any suggestions as to what else I can try?

Original was a low level with flush pipe. New pan is made by Stafford Ceramics who cannot be bothered to answer my emails. Identical pan fitted in downstairs cloakroom which initially suffered same problem but once pan connector changed from swan neck with extension (from pan to swan neck) to 90...

The wall thickness of the lead pipe is not much about 2mm I think but didn't measure it. The diameter of the WC pan outlet is even smaller so the 3" pipe should handle the flow which it did with the old WC before I changed it.

Recently installed back to wall WC pan with push button dual flush. WC flushes OK but small solids come back into pan afterwards. Extra flushing (including bucket of water direct down pan) will not get rid. Waste pipe is 3" lead thro wall at 14 deg slope then 90 deg bend into 4" CI soil stack...