To prevent severe mechanical jams, plumbing clogs, and premature motor burnout, you should never put grease, cooking oils, coffee grounds, large animal bones, corn husks, celery, potato peel masses, onion skins, eggshells, or non-food items down a garbage disposal. Liquid fats solidify inside cold drainage pipes, fibrous husks wrap tightly around spinning impeller blades, and starchy waste expands into thick paste, forcing the motor to overheat and requiring costly professional plumbing repairs.
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