M
mysteryman
As it's happening on two loos, there is a common factor, which must be something pulling a vacuum on the sewer. Dynorod?
falling water level in toilet bowl
- Thread starter Kelly76
- Start date
Sponsored Links
Hiya,
No, didn't seem to make a difference, the water level is still dropping even with the drain lid raised.
To answer another question, yes we have a toilet upstairs. This is fine though, water level is sitting in the same place it always has.
Someone else mentioned it may be a venting problem caused by the upstairs toilet... would it be worth testing the pipes with a smoke pellet?
No, didn't seem to make a difference, the water level is still dropping even with the drain lid raised.
To answer another question, yes we have a toilet upstairs. This is fine though, water level is sitting in the same place it always has.
Someone else mentioned it may be a venting problem caused by the upstairs toilet... would it be worth testing the pipes with a smoke pellet?
Sponsored Links
Hey,
The toilet is sat on a concrete floor, around that is just some wood laminate. Toilet basically runs straight down into the sewer system, I can't see any vents or anything.
I've had a good look all around the toilet and there are no cracks anywhere, the seals are all still well in place and when you flush you can see the water running clearly and fast down into past the manhole cover.
It's a real mystery, the guys from South East Water had a good look round as well, they said the toilet is fine and the pipes are fine, it's just one of those things and nothing to worry about..... but I can't see how it can be just one of those things when I don't know what that thing is. I mean toilets don't just empty themselves for no good reason, there has to be a reason.
So my quest continues... just not sure where?
The toilet is sat on a concrete floor, around that is just some wood laminate. Toilet basically runs straight down into the sewer system, I can't see any vents or anything.
I've had a good look all around the toilet and there are no cracks anywhere, the seals are all still well in place and when you flush you can see the water running clearly and fast down into past the manhole cover.
It's a real mystery, the guys from South East Water had a good look round as well, they said the toilet is fine and the pipes are fine, it's just one of those things and nothing to worry about..... but I can't see how it can be just one of those things when I don't know what that thing is. I mean toilets don't just empty themselves for no good reason, there has to be a reason.
So my quest continues... just not sure where?
Surely, this has to be a process of elimination.
1. take the toilet out, fill with water and watch the level.
2. Stuff drain rods down it, and ensure its not blocked.
if all ok, its not a problem with that specific leg of the drain.
3. if you cracked the lid of the nearby manhole, then its not suction being caused down stream.
4. It must be suction being caused by something else drianing into the same drain from up stream.
so i would hazard a guess as a blockage in the soil vent pipe, something like a bird nest or dead bird..
Its the only possible thing left.
1. take the toilet out, fill with water and watch the level.
2. Stuff drain rods down it, and ensure its not blocked.
if all ok, its not a problem with that specific leg of the drain.
3. if you cracked the lid of the nearby manhole, then its not suction being caused down stream.
4. It must be suction being caused by something else drianing into the same drain from up stream.
so i would hazard a guess as a blockage in the soil vent pipe, something like a bird nest or dead bird..
Its the only possible thing left.
M
mysteryman
My son aged about three came out of the bathroom with a mug of water. He couldn't reach any of the taps...
5. put a piece of hose round the trap so that it vents the drain beyond
then leave for the hour that " things happen " Have this problem in the upstairs toilet and not the down. During strong winds as the air blows over the top of the stack it will create a vortex with the relativly warmer air from your poo pipe. I have taken the time to connect a manometer to the stack itself and can see as the wind blowns a negative presure of -5 mbar. Thats a fair bit of suction consdering a boiler fan opperates at around -3 to -5mbar. The water also moves in relation to the manometer. Solution fitted auto air admitance valve (dago) to top of stack.
As the pan is flushing and running OK to the manhole, yet the water level is still dropping with the manhole cover open, then it would have to be a hell of a suction source, as the drain from WC to manhole is open to atmosphere.
Have we ruled out a double trap syphonic suite?
Have we ruled out a double trap syphonic suite?
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
Sponsored Links
