One other thing. A few years ago we put too many potato peels down the sink and the disposal chewed them up OK but the chunks got clogged inside the drain pipe. If you look under your sink, you will see the white plastic drain pipe coming out of the disposal and going into a "Y" connector that is in the pipe coming from the other sink and down to the floor for the drain. It turns out that there is a plate inside the "Y" connector that separates both sides of the incoming pipe. It reduces the size of the inside diameter of the "Y" connector to less than half of what it looks like it should be from the outside. You can see what it looks like if you go to the plastic plumbing aisle at Lowes or Home Depot.
Anyway, all the ground up garbage had collected there and couldn't get through the smaller sized opening to go down the drain. I had to take apart the plastic pipe around the "Y" connector and clean out the mess. Now, whenever we have a lot of stuff to go down the disposal, we add the items slowly so that it doesn't have too much all at once to go through that "Y" connector. Haven't had a problem since.
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