One widespread myth regarding garbage disposals is that they can handle any food—including all food parts—that you put in them. That’s not accurate.
A garbage disposal cannot handle items like bones, pits, corncobs, seeds, or ice cubes.
The disposal also won’t function effectively if you put stringy materials like pasta, celery, asparagus, maize husks or silk, lettuce, or banana peels in it.
Food and water can’t move through because grease, fat, and oil solidify and clog the drain and garbage disposal. Eggshells and coffee grounds produce tiny, sticky granules that easily get into narrow spaces and cause problems. When dried, starchy vegetables like beans and potato peels turn into a thick paste resembling bacon grease, fat, and oil. The paste will jam the machine and clog it.