WC issue - please help!

[Set Square]

But from the OP's subsequent description of the cap at the top of the sub-stack, I'm pretty sure that there *isn't* an AAV.

[NikV]

apparently the smell of H2S is so strong (assuming normal senses) that it is almost impossible die from it - it becomes physically unbearable retching/vomitting at concentrations 1000 times below lethal concentrations, iirc it is detectable at levels of parts per billion

Nik

[Dave Jones]

[Set Square]

It *could* be - but it doesn't look too much like her description.

[It would help if you left out the space in the link between the slash and the P]

[Dave Jones]

[Pete C]

Hi,

Is the loo carpeted? It could be someone has spilled a lot of loo cleaner on it at some point and the smell accumulates overnight.

BTW if putting the plug in the sink overnight to see if it helps, tape over the overflow too.

cheers, Pete.