Hi there.
I have a bathroom with bath sink and WC on a stack with an AAV.
When I empty the bath, after a while large bubbles start coming up toilet.
If I flush, the bowl fills and only very slowly empties out.
Do I have a stuck air admission valve or is a blocked stack more likely ?
I have a bathroom with bath sink and WC on a stack with an AAV.
When I empty the bath, after a while large bubbles start coming up toilet.
If I flush, the bowl fills and only very slowly empties out.
Do I have a stuck air admission valve or is a blocked stack more likely ?