Hi all,

I have a bungalow with 2 toilets main and cloakroom, both fitted by me in
the last 12 months.

A couple of times I have thought I have imagined the water level in the bowl
of the cloadroom toilet was lower than it should be, but one flush, things
seemed OK. Definitley no leaks under or around it.

On saturday, I went to use the main loo, and the water level was lower ...
so much so that the back of the U bend was uncovered. Pondering on it, I
flushed, and watched. The level went back to normal, and then about 5
seconds later, it fell, as if sucked down. I flushed again, and it stayed
OK, and has been since.

So I have some questions please :

1) Is this normal ?
If so, what causes it. Remembering my basic physics the pressure in the
sewer must have dropped, so why ?
2) Could it have anything to do with out soil stack ? Birds nest/ blackage ?
3) ... depending on 1/2, is it anything to worry about ?

Thanks in advance