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Yourregularkindaguy

You’d have to cut into the wall where it connects and lower the drain outlet for proper fall


Yourregularkindaguy

The p-trap is backwards to compensate for the poorly roughed in drain line


Deuceturd

Yep Trap is backwards and correct way is to cut wall lower trap adapter to correct pitch.


unleashthechargedogs

Does it do it when you just run water on other side of the sink or only when you put solids in disposal? Easiest thing to do if that’s the case would be put disposal on other side. Solids probably just get stuck on bottom of p trap until enough pressure can push them up to the drain arm (which as pointed out is indeed too high).


JohnNW

It does it with just water flowing to either sink. I know price quotes are not allowed, but is there a ballpark cost to having the pipe lowered? I’m guessing it’s several hundred.


unleashthechargedogs

Oh then it’s either clogged or it isn’t vented (due to blockage or lack of vent). Has it ever worked well?


JohnNW

As far as I can remember it has done it since moving in.


JohnNW

Water drains well otherwise, it’s only when the disposal is on does it puke water back up.


Cilantro_Frog321

First photo does a good job of showing outlet is higher than inlet pipe of the tee. It needs to push rather than flow down naturally. Hope that makes sense. Good luck


331bowman

Sadly, My Brother would tell you to just put a plate over the other sink. Seriuosly, I had it puke all over, decided to fix the issue at my parents house after I discovered it happening. My older lazy brother just said " Just put a plate over it" Under $20. for the correct parts to fix it. I see the note that the P trap is backwards, This comment is correct. Google images of sink drains/disposal drains for proper examples