Help ! I've been scratching my head about this for some time, perhaps someone else out there has experienced this and knows a solution ?
The water in the toilet bowl in our downstairs loo sometimes drains away to nearly empty. Often at least enough water drains away to leave an air passage through the pipe to the drain, so it get a tad smelly in there....
After flushing the water level is fine. Then it can take hours ( sometimes days ) without use, and on return the water level has dropped significantly.
I have checked for blockages in the bowl bend and in the pipe leading to the drain, both of which seem clear.
Also considered it may be an air pressure problem - when the door is closed the air cannot escape anywhere so the pressure pushes the water level down and some drains away. This is evident when the door is swung shut and watching the water level. Leaving the wind open resolves this so it's been discounted.
Any other suggestions / opinions ?
Thanks in advance,
Jon