My niece just bought a new house,she also bought all new kitchen appliances the way the owner had the dishwasher set up is like this,the dishwasher was at the end of the counter about 7 ft away from the sink so instead of running the drain hose though the cabinets he ran it though the floor into the basement along the joist's then back up though the floor under the sink to the drain pipe,now when I removed the old washer it has a small amount of water still in the bottom,well the brand new 1000 dollar Bosch washer won't fully drain either,
after looking over it today where the drain hose go's though the floor right under the dishwasher there is a 4in pvc drain pipe could I just tap the hose right into it and forget about running it back up to the sink? would this work? Thank's in advance for any help....
I would not do that. It probably will not meet local code in any case.
Check with her Building Inspection Department to see if an air gap is required. (Kind of simply put, an air gap is an above-the-sink inline device used to prevent any drain hose backflow from a plugged drain line getting back into the dw.)
Otherwise, if an air gap isn't required, you can loop the drain line over the top of the dw, and run the drain line through the cabinets to a sink tailpiece connection made for the purpose. It needs to go into a trapped line to prevent sewer gas from backing up into the dw.