Keep bones, pits, fibrous peels, grease, coffee grounds, starches, shells, chemicals, and non-food items out of the disposal.
Below you’ll find a clear “never” list, the reasons those items cause trouble, and better ways to deal with them. You’ll also get simple operating habits, a quick fix matrix for common hiccups, and care steps that keep things humming.
Things You Should Never Put In A Garbage Disposal
Here’s a master list to keep near the sink. If it lands in the “Never” column, steer it to the bin, oil can, or compost pail instead.
| Item Category | Why It Causes Trouble | Better Move |
|---|---|---|
| Bones, Fruit Pits, Shells, Popcorn Kernels | Too hard; they rattle, jam, chip parts, and shard into the trap. | Trash them. Skip compost for bones and pits; they break down slowly. |
| Stringy Produce (Celery, Corn Husks/Silk, Leek Greens, Asparagus, Artichoke Leaves, Pineapple Cores, Mango Peels, Onion Skins, Banana Peels) | Fibers wrap the flywheel and grind ring like thread. | Cut small and bin or compost. Keep long strands out of the sink. |
| Starches (Potato Peels, Mashed Potato, Pasta, Rice, Oats, Bread Slurries) | Clump and set like glue; pack the trap and line. | Scrape to the trash. If a bit slips in, run a long cold-water flush. |
| Fats, Oils, Grease | Cool on pipe walls and build a sticky plug. | Pour cooled grease into a can and toss; wipe pans before washing. |
| Coffee Grounds, Tea Leaves, Nut Shells, Coarse Spices | Granular grit settles in low spots and slows flow. | Trash or compost grounds and leaves; avoid grinding them. |
| Eggshells | Membranes can tangle; shells grind to sand that lingers. | Compost or bin shells instead of grinding. |
| Non-Food Bits (Glass, Metal, Plastic, Twist Ties, Rubber Bands, Produce Stickers, String) | Chew up seals, jam parts, and scratch the chamber. | Use a sink strainer during prep; empty it often. |
| Harsh Cleaners & Drain Chemicals | Can weaken gaskets, pit metal, and off-gas. | Use dish soap, ice, baking soda, vinegar; keep chemicals out. |
| Expandable Dry Foods (Dry Rice, Instant Oats, Dry Pasta, Chia) | Swell downline after grinding, where access is harder. | Trash them dry; don’t hydrate them in the drain. |
Manufacturer pages back up these basics. If you’re curious about model-specific allowances, scan the InSinkErator use and care, then stick with the safest path for your kitchen.
Hard And Dense Items
Bones, fruit pits, seafood shells, and popcorn kernels look small, yet they’re tougher than they appear. They spin, hammer the chamber, and leave scars. Even if a shard squeaks through, it can wedge in the trap and start a blockage. Toss them. If you compost, bones and pits still don’t fit; they take ages to break down.
Stringy And Fibrous Produce
This is the classic sink wrecker. Celery threads, corn silk, leek greens, asparagus ends, artichoke leaves, pineapple cores, mango peels, onion skins, and banana peels twist like tinsel. Strands wrap moving parts and slow the motor. Keep them out. Cut short, then bin or compost the pile.
Starchy Foods That Clump
Potato peels, leftover mash, pasta, rice, oats, and bread slurries turn sticky once soaked. They pack the trap and set like paste. Scrape plates first. If a spoonful slips in, chase with a long blast of cold water to push it clear.
Fats, Oils, And Grease
Warm grease flows as liquid, then cools and sticks to pipe walls. Add a dusting of coffee grounds or flour and you’ve got a plug. Pour cooled drippings into a can, let them harden, and toss. Many cities accept used cooking oil at drop-off sites; check local rules if you prefer that route.
Grounds, Shells, And Grit
Coffee grounds and tea leaves don’t cut; they accumulate. The fine grit settles in low spots and slows the drain. Empty filters into the trash or compost instead. The same goes for nut shells and coarse spice rubs in any real quantity.
Eggshells
Eggshells split opinions. The thin membrane can wind around moving parts, and the shell turns into sand that hangs in the line. Save the grinder the hassle. Compost shells or toss them.
Non-Food And Small Bits
Twist ties, produce stickers, rubber bands, string, glass, metal, and plastic are sink saboteurs. They chew up seals and jam the flywheel. A small mesh strainer during prep catches these quietly. Empty it as you cook so it never overflows into the drain.
Harsh Chemicals
Strong drain cleaners can pit stainless parts, weaken gaskets, and splash fumes back at you. If the unit slows or stops, don’t pour chemicals. Kill power and use safe clearing steps instead. You’ll find those steps in the quick fix section below.
Expandable Grains And Seeds
Dry rice, instant oats, dry pasta, and chia drink up water and swell after they pass the grind ring. That expansion happens downline in tighter pipe runs. Put them in the trash dry so they never balloon in the drain.
Use Habits That Help The Disposal
A few tiny habits pay off every single day. Run a strong stream of cold water before, during, and after grinding to carry particles away. Feed scraps gradually, not as a packed handful. Cut bulky pieces into smaller chunks before they reach the sink. Keep fibrous bits and skins out from the start.
Cold water helps fats congeal so they break up on the way to the trap instead of painting the pipe as a thin film. Hot water has its place for dishwashing; keep cold on while the grinder runs.
Citrus peels can freshen smells, but only in coin-sized pieces. Big rinds are tough. For a quick refresh, pulse a handful of ice with a few small peel pieces under cold water. Skip bleach and heavy chemicals; mild dish soap and a brush handle things well.
For a reality check on safe and unsafe foods, bookmark this plain-language list from a trusted tester: Consumer Reports disposal tips.
Items That Should Not Go Into The Garbage Disposal At Home
Cleanups move fast, and that’s when mistakes happen. Keep a red-flag list in your head for party nights, holiday cooking, and big batch prep so the sink stays drama-free.
Holiday Birds, Shells, And Seasonal Scraps
Roasts leave bones and string. Seafood nights leave shells. Fall cooking brings pumpkin strings and seeds. Summer grilling fills the sink with corn husks. None of these belong in the grinder. If you compost, shells and bones still don’t fit; they take too long to break down. Send them to the bin instead.
Batters And Dough
Mixers leave thick batter and sticky dough. That slurry acts like paste in the trap and line. Wipe bowls and beaters with a spatula or paper towel into the trash before washing. The wipe takes seconds and spares the drain a messy job.
Deep-Fry Oil
Frying sessions generate cups of oil. Pour it into a heat-safe container, let it harden, then toss. If you want a greener option, see if your city collects used cooking oil. The U.S. EPA’s FOG guidance explains why drains and sewers struggle with it.
Seeds, Skins, And Strainers
Canning and pickling days send seeds and skins everywhere. A mesh strainer and a counter compost pail save the grinder from stringy loads and keep jars clean faster. It’s a tiny setup that pays for itself in fewer clogs.
Quick Fixes For Common Disposal Trouble
Stay calm. Never reach inside with power on. Unplug the unit or flip the breaker first, then use tools, not fingers.
| Symptom | Likely Cause | Safe First Steps |
|---|---|---|
| Hums, Won’t Spin | Jammed by a hard or stringy item | Cut power. Press reset. Use the hex wrench under the unit to free the flywheel; remove debris with long tongs. |
| Silent, No Power | Tripped overload or breaker | Press the red reset button under the unit. Check the breaker and outlet. Restore power and test with water running. |
| Slow Drain | Starch paste or settled grit | Run a long cold-water flush. Pulse ice with coarse salt. Clean the splash baffle. Avoid chemical drain cleaners. |
| Bad Odor | Film on the baffle and chamber | Scrub the underside of the rubber baffle with dish soap. Rinse, then pulse ice and a pinch of baking soda. |
| Rattle Or Grind Noise | Foreign object in the chamber | Cut power. Use a flashlight and long tongs to remove the object. Never put your hand inside. |
If these steps don’t clear the issue, stop and call a licensed plumber. Forcing a jam can burn the motor or damage the housing.
Care Routine That Keeps The Sink Moving
Weekly One-Minute Clean
Give the unit a minute with cold water and a handful of ice to keep edges clear. Rinse the rubber splash guard from both sides; that flap traps grease and food film.
Biweekly Scrub
Every couple of weeks, scrub the baffle and the visible chamber with dish soap and a long brush. Lift the splash guard and clean the underside, where slime hides. Finish with a long cold rinse.
Keep It Moving
If the grinder sits unused for a stretch, spin it with water for a few seconds every few days. That keeps parts moving and helps prevent surface rust on steel components.
Better Ways To Get Rid Of Scraps
A small compost pail on the counter is the simplest upgrade. Most fruit and veg scraps, coffee grounds, tea leaves, and eggshells belong there, not in the drain. Many cities now offer curbside food-scrap pickup or drop-off sites. If you don’t compost, bag scraps in paper and bin them.
Pour cooled grease into a can or a foil-lined cup, then toss. Wipe oily pans with a paper towel before they hit the sink. That single wipe prevents a lot of pipe scraping later.
Use a sink strainer during prep. It catches twist ties, produce stickers, and stray pasta. Empty the strainer as you cook so it never overflows into the drain.
Simple Rules That Save Repairs
Think small, cold, and gradual. Small pieces, cold water, gradual feed. Keep grease, stringy scraps, hard objects, chemicals, and non-food bits out. If trouble starts, cut power and use the reset, wrench, tongs, and cleaning steps above. When in doubt, check your model’s guidance and local rules, and default to the safest option.