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Care for a garbage disposal by running cold water before, during, and for fifteen seconds after each use, feeding it small amounts slowly, keeping grease, fibrous scraps, and non-food out, and cleaning the chamber and the splash guard monthly with ice, coarse salt, and a brush. Clear a jam with the hex key underneath and the reset button, never with a hand in the chamber. That is the whole maintenance program, and a disposal treated this way lasts for years.
Which habits keep a disposal working?
Cold water is the habit that matters most: it keeps grease solid so the disposal can chop it and the drain can carry it, instead of letting it melt and coat the pipe. After that, feed the disposal gradually rather than in one dump, keep it to soft, small scraps, and let it run until the grinding sound clears. A disposal on a septic system needs the same habits and a lighter load; the septic guide explains why.
| Do | Do not |
|---|---|
| Run cold water before, during, and after | Run it dry, or with hot water |
| Feed small amounts at a time | Dump a full plate at once |
| Soft scraps: cooked vegetables, small bits of meat, fruit | Grease, oil, fat; fibrous peels, husks, celery; bones; coffee grounds in quantity; pasta and rice in quantity |
| Let it run until the sound clears, then water for fifteen seconds | Stop it mid-grind |
| Grind ice and coarse salt monthly | Use chemical drain cleaners |
What do you need?
For monthly cleaning: a tray of ice, coarse salt or baking soda, a cut lemon or orange, a dish brush, and dish soap. For a jam: the hex key that came with the disposal (a quarter-inch Allen key fits most), tongs or pliers, and a flashlight. The reset button is on the bottom of the unit and needs no tool.
- Ice cubes and coarse salt (or baking soda)
- Citrus peel for the smell
- Dish brush and dish soap for the splash guard
- Quarter-inch hex (Allen) key
- Tongs or needle-nose pliers, and a flashlight
What are the steps?
Monthly, with the disposal off, scrub the underside of the rubber splash guard with soap and a brush, then run the disposal with cold water and a tray of ice and a handful of coarse salt until the grinding stops, then a citrus peel. For a jam, cut the power, turn the hex key in the bottom socket until the plate spins freely, remove the object with tongs, press reset, and test with cold water.
- Turn the disposal off. Lift the splash guard's flaps and scrub its underside with the brush and dish soap; that is where most of the smell lives. Rinse. Done when: the rubber is clean and free of film.
- Turn on cold water, start the disposal, and pour in a tray of ice and a handful of coarse salt. Let it grind until the sound clears. The ice knocks buildup off the chamber walls.
- Drop in a citrus peel or two and run it with cold water for a few seconds. Done when: the drain smells of citrus rather than sink.
- If the disposal hums but does not turn, or is silent: switch it off at the wall switch, then unplug it under the sink or switch off its breaker. Confirm it is dead by trying the switch.
- Find the hex socket in the center of the bottom of the unit. Insert the hex key and work it back and forth until the grinding plate turns freely a full rotation in both directions. Done when: it spins with no resistance.
- Shine the flashlight into the chamber and remove whatever caused the jam with tongs. Common finds: a bottle cap, a fruit pit, a piece of glass, a spoon.
- Press the red reset button on the bottom of the unit until it clicks and stays in.
- Restore power, run cold water, and switch the disposal on. It should spin up and run smoothly. Done when: it runs clean with water flowing, and the sink drains.
When should you stop and call a pro?
Call a plumber if the disposal leaks from the body or from the bottom (the seals or the housing have failed, and it is usually replaced rather than repaired), if it trips the breaker repeatedly, if it still hums after clearing a jam and pressing reset, if the sink backs up with the disposal running (a drain problem past the unit), or if you cannot free the plate with the hex key. Never reach into the chamber for any reason, with the power on or off, and never use a chemical drain cleaner in a sink with a disposal.
A disposal that is more than a decade old and increasingly noisy or slow is near the end of its life; replacement is a plumber's hour, or a confident homeowner's afternoon with the manual.
What should you record?
Record the disposal's model and install date (on the label under the sink), the monthly cleaning date, and every jam and what caused it. A pattern of jams from the same thing is a household habit to change, not a disposal problem. Set the monthly clean as a recurring task with the dishwasher filter and the range hood filter.
Common questions
The disposal hums but does not turn. What now?
It is jammed. Turn it off, unplug it or switch off its breaker, put the hex key that came with it (or a quarter-inch Allen key) into the socket on the bottom and work it back and forth until the plate turns freely, remove whatever fell in with tongs, press the red reset button, restore power, and run cold water. Never put a hand in the chamber.
Can I put coffee grounds, eggshells, or potato peels in it?
Better not. Grounds and eggshells are fine for the disposal but settle in the trap and the drain line and build a sludge; potato peels, celery, onion skins, and corn husks are fibrous and wrap the impellers. Grease and oil coat everything. Scraps that are soft and small are what the disposal is for.
Why does it smell, and does it need a special cleaner?
Food film on the splash guard's underside and in the chamber. Scrub the rubber guard with a brush and dish soap, run ice and coarse salt to knock buildup off the walls, then a cut citrus for the smell. No chemical drain cleaner, ever; it damages the seals and it is dangerous if the unit jams with cleaner inside.
What should you do next?
Scrub the splash guard tonight; it takes two minutes and it is usually the whole smell. Then treat the kitchen drain as a system: keeping drains clear covers the trap and the line the disposal feeds, and the dishwasher filter shares the same drain.
