toilet flush

[runningpaul]

hi all,please can any one shed light on our problem? when we flush the water and anything in it flushes away but the water level has dropped alot to what it is normally, also on flushing the water comes up to just below the rim before dropping and flushing away.
please help

 

[kilovolt]

Sounds like partial blockage check drains under manhole cover

 

[pipeslice]

As kilovolt said partial blockage or stack vacumn

 

[runningpaul]

hi, we don`t have a man hole/cover and could you please explain more on the stack vaccum......... would a plunger help ? thanks very much

 

[WickedWizard]

Is this an upstairs or downstairs toilet?
Is anything else affected e.g kitchen gulley?

 

[swbjackson]

If the vent pipe is blocked as the toilet is flushed it will try to pull air down the stack and create a partial vacuum.

Most common cause of this is a stuck air admittance valve but I came across a case where the vent in the loft was via a flexible hose, this had sagged and condensation had created a water trap in it.

 

[andytheplumber]

Get stuck in with a plunger, that should do the trick

 

[runningpaul]

it`s a down stairs toilet,the up stairs one seems fine and nothing alse seems blocked,going to the plunger shop and give it a good plunge.
thanks every one.