Deep sink garbage disposal drain problems

[thrivin]

Looking at previous posts, I see I have a common problem. After installing new countertops and deeper sinks, the drain outlet on my garbage disposal is about 1 to 1-1/2" below the level of the wall drain pipe. Without tearing into the wall, it appears the drain takes a 90 degree turn and goes horizontal through the wall. That would seem to make it much harder (or maybe impossible) to lower the wall drain height which is the solution commonly noted in the forums.

However, I do have the dishwasher standpipe and I'm unclear as to whether or not there could be a legitimate way to connect the disposal drain to that pipe and what it would take to do that.

Any thoughts are helpful!

 

[Jadnashua]

It looks like if you shortened the tailpiece on the lefthand sink and ran it and the outlet of the disposer to a baffled T to a trap, you should be fine.

 

[Sponsor]

 

[Terry]

If the trap arm from the wall is higher than the outlet of the disposer, then yes, you will always have water standing in the disposer.

If that is the case, you may want to consider going into the wall and lowering the tee in the wall.
Or you may run the dishwasher into the disposer and use the dishwasher drain from the wall for the sink. It's plenty low.

 

[hj]

That dishwasher drain connection would normally NOT be proper, and even if it were, anytime the sink drain ran slow the disposer would cause it to overflow into the cabinet. Take the DW drain out, connect the disposer to that opening, then connect the DW to the disposer's DW inlet connection.

 

[striider]

That dishwasher drain connection would normally NOT be proper, and even if it were, anytime the sink drain ran slow the disposer would cause it to overflow into the cabinet. Take the DW drain out, connect the disposer to that opening, then connect the DW to the disposer's DW inlet connection.

I have the EXACT setup seen in the picture above. I like the solution of changing the lower fitting from dishwasher to a drain inlet and using the knock out in the disposal for the dishwasher hook up. How do I remove the old pvc p-trap and put in a proper outlet (that the pipe slips in and out of to adjust depth) so I can tie the drains to it?

Or...can I leave the P there on the dishwasher drain and connect to it from the top, but then I will have 2 p-traps? Is that ok?

 

[hj]

"Or...can I leave the P there on the dishwasher drain and connect to it from the top, but then I will have 2 p-traps? Is that ok?"

That would be the MOST NOT OKAY thing you could do.