Originally Posted by TheEplumber
No pipe should have standing water in it except a trap. Better put some grade on it
Can't. It's hardwired in concrete. I made a mistake to trust someone who came across as a know-it-all experienced plumber. Then the mistake was compounded when the vent pipe was built into the concrete block wall. Now there really is no clearly apparent easy work around possible.
Anyway, what are the implications of having standing water in a 2" abs pipe from a shower? What's the worst that can happen. Also, if 2/3 of the pipe roughly is standing water that means that less of it is accessible as vent. What can be the implications of that?