I live on the ground floor of a three story condo building. Occaisionally my toilet starts 'gurguling' and then somtimes the gurgling is followed by rising water and soap suds.
When this happens, I am not using the plumbing or running water in my condo at all. Normally, the toilet flushes and the tub drains very quickly, so I do not think it is a drain clog issue.
My theory is that when one of my upstairs neighbors is doing laundry or draining their tub, the water falls three stories and hits the bend in the pipe underneath the my floor causing back pressure. Would an appropriate fix to this be to add an offset by my ceiling into the drain pipe to slow the water down?
Any other ideas as to what can be causing this - my theory could be wrong... And what would some options be to fix this?