[dreal1]

3/4 in comes out of slab and 90's over into 2 in. I added laundry tub and little giant pump to move water along since gravity won't do it but now I get a laundry water backing up at sink. It drains quickly once rinse cycle and pumps are done. When I had washer draining directly into the 3/4in drain this problem didn't occur.

yes there's an existing 3/4 in line in the slab that runs up out the slab beneath the kitchen sink and 90's into the 2 in drain. Before I put in the laundry tub I connected the washer discharge hose directly onto the 3/4 in. the washers pump would move the water out on its rinse cycle. Don't know the original purpose of such a "drain". My furnace/ac unit has its own discharge through the wall to the outside.

OK. I'm on a slab levitt ranch. This 3/4 in line goes into the slab at the laundry rm and comes up under the kitchen sink. It then elbows over into the 2in for the kitchen sink. I had the washer's discarge hose connected directly to the 3/4in. The machine's pump on rinse cycle would move the water out. I put in a laundry tub and have the washer hose empty into it, but gravity alone won't move the water down the 3/4in and up at the other end into the 2in. So I put in a little giant utility pump bushed the discharge down to 3/4 with pvc and connected to the 3/4 with hose. So now when the washer empty itself not the tub the pump moves the water out but now I get some of it backing up into the kitchen sink. The back=up is brief and the water moves out quickly once pump is done. But I want to keep that from happening. Thanks

[speedball1]

I got to be missing something here.
Are you discharging your washer into a 3/4" drain line? And what's a 3/4" line drain in the first place? A AC condensate line? Now we both know that no washer discharges into that small a line so do you wish to repost your complaint?> Cheers, Tom


I'm still attempting to understand your setup. So you discharged your washer into a 3/4" PVC pipe that you had no idea where it came from. ( What's the 3/4" line connected to now?)
You then put in a laundry tray in your basement and a pump to lift the discharge up to where?
When you installed the laundry tray did you trap and vent it?
I take it that the washer discharges into the laundry tray and it backs up before it drains away. Is that your complaint? What size pump and where does it drain to? Back to you. Tom