A garbage disposal is one of the most misunderstood appliances in your kitchen. It looks like it can handle anything, but the reality is that the impellers inside aren't blades — they're blunt teeth that fling food against a grind ring. Soft, biodegradable scraps go through fine. Anything stringy, starchy, hard, or greasy fights back, and your drain line takes the damage.
The do-not list
- Grease, oil, and fat. They liquid in the pan but solidify in your pipes, building up like cholesterol until the line clogs.
- Coffee grounds. They look fine going down, then settle into a sludge in the trap. One of the top causes of slow kitchen drains.
- Eggshells. The membrane wraps around the impellers, and the shells turn into a sand that settles in the P-trap.
- Pasta, rice, and bread. They keep absorbing water after they go down, swelling and gluing themselves to the pipe walls.
- Fibrous vegetables. Celery, corn husks, onion skins, asparagus, and artichokes wrap around the grinder and jam it.
- Potato peels. The starch turns into a paste that's almost identical to wallpaper glue.
- Bones, fruit pits, and nut shells. Too hard to grind. They bounce around, dull the impellers, and chip the grind ring.
- Non-food items. Twist ties, produce stickers, paper towels, sponges — none of it belongs there.
What's actually safe
Soft food scraps that are already small: rinsed plate scraps, soft fruit, cooked vegetables, small meat bits without bones. Run cold water for 15 seconds before, during, and after use — cold keeps any fats solid so they grind up instead of coating the pipe.
Keeping it healthy
- Run it regularly. Once a week minimum, even if just with water. Idle disposals seize up and rust.
- Use cold water, not hot. Hot water melts grease, which then re-solidifies in the line.
- Skip the lemon "freshener" trick alone. Citrus rinds are fibrous. A handful of ice cubes with a small lemon wedge works better — the ice scours the chamber.
- Don't use chemical drain cleaners. They eat the rubber splash guard and seals.
If it jams
Turn off the power at the wall switch and at the breaker before reaching in. Most disposals have a hex socket on the bottom — insert the supplied Allen wrench and rotate back and forth to free the impellers. Then press the red reset button on the underside.
If it hums but won't spin, or leaks from the bottom, the motor has gone or the seals have failed. Replacement is cheaper than repair at that point. Our plumbers can swap a unit in under an hour.