Q: If when using the shower or dishwasher the toilet gurgles or doesn't flush correctly, what should a person do?
A: If
your toilet gurgles or doesn’t flush correctly you may have a clog in
your toilet or downstream somewhere. If it occurs when using other
plumbing fixtures, it may be a clog in the pipes downstream. What is
happening is that the water is looking for place to back up and the air
in the pipes are being forced back through the toilet. Also, another
occurrence may be a blocked vent, if your piping is not vented correctly
or block your toilet will not flush properly.