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Smells from bathroom pipes and sink when using after a few hours

Postby RobM » Thu Aug 19, 2021 8:07 pm

Hi (first time poster).
When we've not used the bathroom sink for a few hours and then use it, we get a nasty smell from the bath plughole (i.e. first thing in the morning and after a day at work).

I've used plughole unblocker on the sink, shower and bath, and use hair plug covers in the sink and shower but still get the wiff / smell.

We've not replaced the bathroom but appears the sink connects into the shower, that in turn connects to the bath before the outlet. I know this because sometimes we hear or see water 'glugging' in the shower or bath when using the sink.

The outlet (c2-3") pipe runs into the rain gully for the kitchen extension.
We've had a look and the outlet looks quite clear, apart from being a bit mouldy inside.
The house was empty for about a year before we moved in about 3 years ago.

I'm wondering if it would help to clean all the pipes right through the system? What would I use, just bleach? What's the best way to do this? We could cap the outlet and flood the system.

Any help would be greatly appreciated.

Cheers,
RM
RobM
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Postby stoneyboy » Fri Aug 20, 2021 9:30 pm

Hi robm
The most likely cause it that when the sink is emptied, a vacuum is created which sucks the water out of the bath trap. Assuming you have a 2” bath trap try fitting a deeper trap.
Regards S
stoneyboy
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Postby RobM » Mon Aug 23, 2021 7:42 pm

Hi stoneyboy,
Thanks, I appreciate the quick reply and advise.
Is the small trap likely the cause of the smell I've getting from the bath plughole?
Regards,
RM
RobM
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Postby stoneyboy » Mon Aug 23, 2021 9:47 pm

Hi robm
It may be the combination of a 2” deep bath trap and long waste pipe runs. Fitting a deeper trap may solve the problem but if space is an issue you may have to use a hepv0 type trap.
Regards S.
stoneyboy
Rank: Project Manager
Posts: 4819
Joined: Wed Dec 10, 2008 6:44 pm


Postby RobM » Mon Aug 30, 2021 6:43 pm

Hi stoneyboy,
Brilliant, thanks.
Regards,
RM
RobM
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