I have been on many calls with a disposal being jammed, not draining, or just not doing anything.
What I have found is that most people believe that a disposal is supposed to "dispose all" you put in it.
I'm really sorry to say that this not at all true. Disposals have to be used with some regard or some good judgement.
Believe it or not but your leftovers are the worst. Spaghetti, rice, and any kind of noodles swell with water so they expand in the disposal and if it does get past the disposal then it must go thru the plumbing configuration below your kitchen sink, which is also a bad idea.
Other things I have found in disposals or in the plumbing pipes under the kitchen sink are freshly cut vegetables, egg shells, coffee grinds, and on a funny note I have also found shot glasses and wedding rings, also not a good idea.
My suggestion is always to scrape leftovers in the trash can and rinse off your plates from there in the sink. It might be an extra duty to take out the trash nightly after dinner because no one wants leftovers smelling up the house, but it sure beats having a jammed or stopped up drain.
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