Two upstairs bathrooms on opposing wall. Bath 1 has shower/tub combo. Bath 2 has shower only. "Stuff" will back up into shower 2 basin during one time only. Only backs up when bathtub in bath 1 is being drained. Wont back up when bathtub in bath 1 is running, only when draining the higher volume from a filled tub.
Have used a Rigid hand powered snake on both. Wife and three teenage daughters, so I'm sure its hair but cant get???? What does it mean that only backs up in bath 2 when tub in bath 1 is drained? Running tub water doesnt do it. Where to snake??? Drain fitting in bottom of tub 1 didnt want to screw back into shoe below tub very easily. New plastic, maybe cross thread...dont want to remove fitting from shoe again. What is best course of action? Chemicals?? On septic and well. Thanks in advance.