Toilet empties when different toilet flushed
Hi, I have a confusing problem.I just installed a new toilet in place of an existing one. The promblem is when I flush the new toto toilet, my other toilet bowl almost completely empties.. The 2 toilets are basically back to back, and use the same vent pipe through the roof.(3 inch copper).No pipes were changed or rearranged and the vent seems to be clear. Anybody ever have similar problem or any suggesstion on what to try next..
Thanks in advance,
Scott