UK Plumber Forum 

A place of resource for Plumbers and Gas Engineers in the UK.

For when your troubles just won't soak away, sort out your drainage issues in here.
By Emcd
Hello, any ideas on how to solve this?
After using the sink in the ensuite, the room fills with a pungent drain smell.

So far I’ve done the following:
1. Used a bottle of drain unblocker.
2. Used baking soda / vinegar
3. Removed U bend and cleaned it.

Neither of these have resolved the issue. When cleaning the U bend, the pipe was lined with a horrible black slime which I’ve removed, it may be covering the pipes I couldn’t reach.

Any ideas or experience of how I could fault find / resolve?

User avatar
hi, yes!

i presume you live in a new build and the plumbings done by unqualified builders and dumb architects!

you will have a Durgo valve behind boxing or posib;y exiting the loft space. this you will find is probably stuck as it is supposed to pop up breifly to release vacuum then quickly shut preventing rising sewer smell. if this does not happen, then it sucks the water out of the trap (usually in the shower). you cn proove this by sealing the shower trap temporarily with say a plunger over the top of the shower drain, you will find it no longer smells. its possible but less likely it is the basin trp doing the same.
other than this, the durgo valve is behind boxing in the same room.
you have one of these under your basin, the gland jams open with debris or age..... ... lve/p82878

hope that helps? :D
trap.jpg (67.39 KiB) Viewed 84 times
trap.jpg (67.39 KiB) Viewed 84 times
central heating

Hello replaced my boiler to a valiant ecotec plus […]

odd bath size

hi, just use a peice of 3x2 batten then tile over.[…]

Drainage issue

It's a new extension about 8 months old with a fla[…]

Problem with boiler/actuator

Hello, Could someone kindly give an opinion on the[…]