Geberit toilet confusion?

[stevdev]

Hey Guys,

Came across a weird scenario today and wondering if anyone could help. Working on a 7 story building with each floor having three toilets, all of which are Geberits.

So here's my issue: When I flush 2 of the 3 toilets on the 7th floor, the 3rd toilet water level in the pan drops and creates a suction noise. All of the other 6 floors are fine and have no problem with flushing.

Anyone have an idea why its creating a suction and why the water level is dropping?

Thanks guys

Steve

 

[SimonJohns]

Fit a Durgo. It's just induced syphonage

Not uncommon even in a normal domestic situation

 

[JCplumb]

:iagree: