15 Things You Should Never Put Down a Garbage Disposal
The modern garbage disposal provides a quick and sanitary way to dispose of food waste, keeping trash bags lighter and landfills from overflowing. But even this venerable appliance can choke on certain items.
Let’s start by debunking a common folk remedy. While it’s true that dropping coffee grounds into your garbage disposal reduces odors in the short term, it can actually cause more serious problems down the drain. To understand why, think about what used coffee grounds look like when taken out of a filter: They reduce into a dense, thickly packed pasty wad. And that is exactly what you don’t want going in your drain lines! You should never, ever pour these 12 things down the drain, either.
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Anyone who’s made spaghetti or mac & cheese knows that pasta expands when soaked in water. Given that, you can see why you might not want to drop lots of pasta into your disposal and drain where it will, after all, soak in water and keep expanding. Like most of the items on this list, a few scraps cleaned off of a plate won’t hurt. But don’t try to dispose of an entire pasta casserole, and when you do run pasta through the disposal, run the water as cold as it will go for 30 seconds afterward, to flush it through the trap and into the mainline.
Garbage disposals are wonderful at grinding up and disposing of food waste. But just because they can grind doesn’t mean they’re made to deal with extremely hard items, such as bones. If you do drop a chicken wing or fish bone in the disposal, don’t panic. Disposals are hardy appliances and can handle grinding up the occasional small bone. But if you try to drop a rack of ribs down your sink and grind them up, you’re setting yourself up for disaster. Watch out for these other kitchen mistakes it’s time to stop making, too.
Much like pasta, oatmeal is another expansion threat. Uncooked oats, in particular, are likely to slip through the disposal untouched, only to collect and expand down-line. If you’re lucky, they’ll eventually flow out to the sewer.
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If you ever find yourself about to dump several handfuls of peanuts down your garbage disposal, take a moment to consider how peanut butter is made: Handfuls of peanuts are dumped into a grinder, where they’re spun and mashed into a sticky, thick paste. And your garbage disposal is an excellent appliance-sized version of a nut grinder. Limit the number of peanuts (and other varieties of nuts) that drop into the disposal and you’ll be far better off. Avoid these ways that you’re cleaning your kitchen wrong.
Chopped, diced, or in chunks, most onion waste shouldn’t be a problem for your disposal. The problem comes with the thin membrane that lies just below the dry, outer-most layer of an onion. That thin, wet layer is often removed before the onion is chopped, and thrown into the disposal. But the layer is so thin that it can pass through the disposal, missing the blades and wind up wedged in the drain, where it catches more items and holds them in place. Luckily, it’s fairly simple to avoid this problem. Just drop the thinnest outer layer in the trash, or cut it up before dropping it in the disposal. It’s a few seconds of work that can save you hours of work or an expensive visit from a plumber.
You may have heard that it’s a good idea to drop egg shells into the garbage disposal. The idea is that the shells somehow sharpen the blades mounted on the disposal wall. It’s hard to say where this theory got started, but if you stop to think about it, when was the last time you’ve seen anyone sharpening knives and lawnmower blades with a carton of eggs? While eggs don’t do much to help your disposal blades, at least the shells themselves don’t do any damage. However, the next time you crack an egg, take a close look at the shell. You’ll see a thin membrane on the inside of the shell that can (like that thin membrane of an onion) get loose and lodge in the drain or around the impeller (the rotor that throws waste against the wall-mounted blades).
OK, speaking of trash, it’s worth saying this officially: We know it’s called a “garbage” disposal. That doesn’t mean that you should put all your garbage in it. Talk to a plumber or handyman, and you’d be shocked by how many times they need to dig out paper towels, bags, candy wrappers and banana peels that definitely don’t belong in the disposal. Find out some more things your plumber really wishes you knew.
Pumpkin and fibrous vegetables
If you’ve ever scooped out a pumpkin for Halloween, you know how the long strands can get caught on your hand and scooper, turning the whole situation into a sticky mess. Avoid transferring that mess into your disposal by disposing of pumpkin guts in the trash. The same goes for veggies like celery and rhubarb. Throw long, stringy stalks straight in the trash to keep the fibers from causing a problem, but don’t worry about small pieces. When chopped up, the fibers are small enough to not cause a problem.
Potato peels are thin enough to slip past the disposal, potentially catching in the drain. There they can cause the same issue as the egg membrane, acting like a tiny catcher’s mitt, holding up other waste and creating a clog. Again, a few peel pieces are nothing to worry about, but many recipes call for several potatoes, and the stack of peels quickly adds up. Learn the foods you should never keep in the freezer, too.