Kitchen sink P-trap is lower than the drain exit?
Context: I’m trying to install an RO system. But my sink has minor backups once in a blue moon. The disposal side backs up and running the disposal removes it. The right side gets backed up once in a while and it’s harder to clear but I can usually do it with a snake. So naturally I worry that the RO waste water would back up the right side where I’d install it more often.
So I’m looking to do a clean out of my ptrap and I noticed the ptrap is lower than the exit. Does this mean that the under sink pipes are holding more water than the ptrap is supposed to hold since the exit is higher than the trap itself?
Should this be fixed? Are my concerns about the RO system valid?
u/gfipr — 1 day ago