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
#6159
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?

Thanks,
Ewan
User avatar
By REDSAW
#6160
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.
or:
you have one of these under your basin, the gland jams open with debris or age.....
https://www.toolstation.com/viva-magna- ... lve/p82878

hope that helps? :D
Attachments
trap.jpg
trap.jpg (67.39KiB)Viewed 10941 times
trap.jpg
trap.jpg (67.39KiB)Viewed 10941 times

Replacing leaking valve is preferred option but if[…]

Shower Pump

Volume of water out of pump can be no more than vo[…]

A coy way to ramp up the bill catching out those w[…]

Gravity or mains fed shower?

Thanks Redsaw but this is a pumped electric sh[…]