mental plumbing system please help me!!!!

[JELLYDANCER]

OK now I know you will all think Im stupid but here goes.
I dont use my bath very often as Im more of a shower kinda gal but tonight I decided to run a nice long hot bath.
Water pressure is a bit slow so I go to make a drink and when I come back.....the toilet is flushing!!!
and continues to flush albeit slowly....all the time the water is filling the bath!
now what is that all about

 

[WabbitPoo]

Maybe this

 

[Hugh Jaleak]

Can be more common than you think! My guess is you have a modern toilet with push button flush and internal overflow. Running the bath lowers water pressure enough to upset the fill valve on the toilet and allow it to open and start filling (an already full) toilet cistern. This then overflows into the toilet pan. Expensive if you're on a water meter!

 

[Burnerman]

Thought I was going completely nuts the first, and only time I've seen this!
John

 

[JELLYDANCER]

ahhha!!! but can it be resolved cos its taking ages to fill the bath!!!

 

[Hugh Jaleak]

Changing fill valve in the toilet might stop it.

John, friends of mine had the same problem. Every time someone turned a tap on elsewhere the W.C. started overflowing down the pan.... With 6 kids in the house it happened quite a lot, and they're on a meter! That was first I saw doing this, seen couple of others with same fault.

 

[Agile]

Jelly, dont turn the bath tap on fully and that should stop the toilet.

The real problem is undersized pipework in the house and/or a restricted flow rate into the house.

To plumbers, presumably a double check valve in the WC feed will cure this?

Tony

 

[JELLYDANCER]

Thanks agile, so how do I find out which it is? Xxxx

 

[JELLYDANCER]

Maybe this

Now that did make me laff!! Cos I did think that lol lol

 

[Agile]

Jelly, dont turn the bath tap on fully and that should stop the toilet.

The real problem is undersized pipework in the house and/or a restricted flow rate into the house.

Tony

 

[mysteryman]

You can always try lowering the water level in the cistern slightly - by adjusting the ball tap.

 

[Agile]

This is a push button cistern. They can be difficult to even open.

Once open the fancy float valves can be difficult to work out how they adjust.

Worse, if you lower the flow the already poor flush would get even worse.

Tony

 

[mysteryman]

There is not a poor flush problem, just a slow continuous flush.

A change in mains water pressure can only affect the flush valve when the filling valve is not fully closed, and a slight lowering of the water level can alleviate the problem. You are correct to state that it may not be easy to do this, but it could be the solution.

 

[cumbriahandyman]

Try flushing the loo just seconds before you run the bath taps, might work...

 

[JELLYDANCER]

ok time to get a man in I reckon lol lol thanks for all your help xx