I have removed the trap - it was perfectly clear - and run a snake down for 6 metres, encountering no obstacles at all (except for getting around the bends.)
I put acid down, and the sink clears to a very good, fast flow, but slows to a very slow flow after: from a few days to a few weeks. I've done this four times.
There is nothing unusual going down the sink. One person uses it to do hands and face washes, nothing more.
When it does slow, it flows normally for about a pint of water, then goes rapidly slower and slower, til the end of draining a sink full of water is really slow.
After I flush it with acid, it will flow much better. Then I pun very hot water down it and that seems to further speed it up substantially.
There is a toilet half a meter away that flushes fine, and I assume (?) that this sink drains into that downpipe.
The plumbing behind the sink is buried in the eaves of the house, behind a plasterboard wall with large stone tiles on it, so not very accessible.
Thanks for any help or suggestions. I really do not want to open the walls into the eaves!
Cheers,
MidAtlantian
I put acid down, and the sink clears to a very good, fast flow, but slows to a very slow flow after: from a few days to a few weeks. I've done this four times.
There is nothing unusual going down the sink. One person uses it to do hands and face washes, nothing more.
When it does slow, it flows normally for about a pint of water, then goes rapidly slower and slower, til the end of draining a sink full of water is really slow.
After I flush it with acid, it will flow much better. Then I pun very hot water down it and that seems to further speed it up substantially.
There is a toilet half a meter away that flushes fine, and I assume (?) that this sink drains into that downpipe.
The plumbing behind the sink is buried in the eaves of the house, behind a plasterboard wall with large stone tiles on it, so not very accessible.
Thanks for any help or suggestions. I really do not want to open the walls into the eaves!
Cheers,
MidAtlantian