Shouldn't a sink be able to take all of the water that is capable of flowing out of the faucets, even if fully opened, without overflowing the sink? The sinks in question are in an old building that has back to back sinks in adjoining rooms.
Thanks for the reply. I'm being told venting is the issue but I felt it was more of a slow drain issue. The problem is I'm not a plumber and the guy telling me it's the vent is a plumber. Thanks again.
it is very rare if not ever a vent problem. the back to back sinks dump into a double san tee. The drain needs to be snaked out. i would get another opinion. why is the plumber saying it is a vent issue?
so you are taking advise from someone who claims to know the solution but cant pass the test. handyman and general contractors know just enough to be dangerous to you and them selves hire a true proffessional to the trade you need help with.