Thanks for the information on the water trap. There was no smell unless I removed the trap. But I can see what you mean about if it's left to dry out.
What I called sewage vapour was meaning to be airborne bacteria coming from the drain, and I think could happen if the shower isn't used and...
I think I have found the answer already!
I had searched the internet last time it happened and found no answer!
But I should have searched again this time before I posted this as I have found another thread discussing it...
I wonder if anyone can advise me on this weird problem - well weird to me!
Can this staining be sewage vapor or is it from hard water?
There is some kind of substance coming from my shower/wetroom drain. I find that if I leave a shower brush hanging from the rail it slowly develops a...