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Tracing odd sewagy smell in dinning room

Posted: Sat Aug 01, 2020 3:11 pm
by G_lo
We have been chasing a smell in our house since we moved in.
There is a sewag-y smell in out side bit and our dining room.
We have so far
found that our sewers were blocked and cleared
Found that our sewers had some open joints and had the whole thing lined

There is still a smell when we let out a bath.

I think this is now from a previously external gully that is under a step....

It’s square. And is 170mm across

Any suggestions to stop the smell coming up ?