Just redid kitchen, with new under the counter 10 inch deep sink, with new drain pipes underneath. I have a new Whirlpool diswasher that I connected the drain to a tee above the trap, and I loop the remaining line. Everything works fine, except the water backs up into the sink when the dishwasher drains. Is the sink to deep that I need lower the tee? Or should I put the sink drain stopper down when the diswashwer is on? The dishwasher is dry when done.
[COLOR=“Blue”]Is the sink to deep that I need lower the tee?[/COLOR]
You may have to.
Check/clean the trap.
Is it a T or a TY. A TY will direct the water down towards the trap.
[COLOR=“Blue”]Or should I put the sink drain stopper down when the diswasher is on?[/COLOR]
No.
The drain has to suck air through the sink drain otherwise you will create a vacuum and the water will not drain properly.
Thank you Deman will try.