We have a toilet that often blocks. (Often as in more than once a month.) I notice that after unblocking the toilet I can smell sewage/waste odours in the bathroom.
For example today the toilet was blocked. Thankfully there were no solids in the bowl, and no paper for a change. I used a plunger and unblocked it. While I was waiting for the cistern to fill up, the bathroom was filled with the usual sewer smell. I think it is coming out of the sink's overflow, but am not 100% sure.
This smell only happens in the moments after unblocking the toilet. The soil stack is outside the house and does not have an AAV.
Why does this smell enter the bathroom after unblocking the toilet?
For example today the toilet was blocked. Thankfully there were no solids in the bowl, and no paper for a change. I used a plunger and unblocked it. While I was waiting for the cistern to fill up, the bathroom was filled with the usual sewer smell. I think it is coming out of the sink's overflow, but am not 100% sure.
This smell only happens in the moments after unblocking the toilet. The soil stack is outside the house and does not have an AAV.
Why does this smell enter the bathroom after unblocking the toilet?