When I run my kitchen sink disposal, it sounded odd earlier today (after I put watermelon rind down it, idiot I guess), but tonight when I ran it, the disposal seems to work fine but the water will not drain. When the disposal is running, it seems to suck the water down into it, but when I turn it off, the water shoots back into the sink.
I unscrewed the P trap, and all looks fine.
I have a 30" drain snake, which I snaked into the pipe that goes into the wall. It came back with black greasy film but nothing else obvious.
Now that I put the P trap back together, the same thing is happening in the sink. Disposal runs but water does not drain and gets kicked back into sink when I turn off the disposal.
Best Answer
There is (obviously) a blockage. First off, watermelon rind should not be placed in a disposer, it's too tough and fibrous and often clogs up the drains.
If you took apart the P trap and found nothing, it's either blocked before or after the trap. Most likely before, at the outlet of the disposer.
Take all the pipes apart and find the blockage. If there is nothing there, then it's in the drain past the part that can be seen below the sink and you need either better tools, like a longer snake or you need to get a plumber in who can clear it for you.