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The Google has conflicting answers. I come from a background of "everything goes in the garbage disposal", my wife's background is "never put anything in the garbage disposal". I suspect reality is somewhere between us.

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From what my home inspector told me, not if you want it to last a long time. –  justkt Nov 29 '11 at 14:09
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11 Answers

I've always put egg shells down the disposal. The "official" word from one manufacturer is:

Most forms of food waste can be put through the food waste disposer — bones from fish and poultry, meat, large meat bones, fish scraps, vegetables, fruit, egg shells, and much more. Very stringy or fibrous foods such as celery should be avoided. Food waste disposers are designed for food waste only and packaging materials should not be put into the disposer.

Given that this manufacturer says you can put large bones in a disposer, I can't imagine that eggshells would do any damage.

And as a practical matter, I've seen name-brand disposers at Home Depot for $100, so even if you felt you were shortening the life of your disposer by a small percentage by putting too much into it, it's not a big deal to get a new one.

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Its one thing to replace a garbage disposal for a mere $100, but if plumbing problems result from putting the wrong stuff down, that can cost a great deal more. That said, I am comfortable putting most small items down. But I avoid bones, vegetable peels, celery, etc. –  Justin Standard Mar 5 '11 at 6:48
    
I've never had a problem with "crisp" peels, e.g. apple, carrot, cucumber. My biggest disaster was with a large quantity of spaghetti. –  uncle brad Mar 5 '11 at 16:15
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living in an old house (~100 yrs) with old plumbing and old pipes, i barely put anything down our drains except liquids. besides, eggshells are FANTASTIC for your roses and your compost. why waste them? : )

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I live in a condo in the city. I've only got two options: sink or dumpster. –  kubi Mar 5 '11 at 2:56
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if you rinse them out and let them dry, i am sure someone with a compost pile would take them off your hands. i am just really leery of putting too much down a disposal, to be honest, plus they are so good for soil that it just seems silly to me to waste them that way. if you must, i would think grinding them up in a disposal would be ok. –  franko Mar 5 '11 at 2:59
    
+1 for compost. –  johnny Mar 5 '11 at 16:21
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If you have a septic tank, avoid using the garbage disposal, especially for anything like egg shells, bones, coffee grounds, and other things that the bacteria in the tank won't eat. Worst case scenario is that they can plug up your leach field for a very expensive repair.

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Generally if you have a septic tank you shouldn't put in a garbage disposal. Usually septic tank houses don't come with one pre-installed. –  jandjorgensen Apr 10 '12 at 18:36
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We give our egg shells back to our chickens. They need the chalk for new eggs and they like it. But I think this isn't really an option for you, unless you sometimes feed the birds in the park or something.

You can eat the egg shell yourself, it's quite healthy (if I can believe the internet).

You can put them in the compost container, but I wouldn't put them in the septic tank. Just throw them away in the garbage.

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Another use for egg shells is when brewing coffee -- my dad would put an egg shell in with the coffee grounds; the internet claims it's a pH thing, to counter acidity. –  Joe Mar 6 '11 at 4:37
    
@Joe: I didn't know that. And does it affect the taste? Or why does your dad do it? –  Mien Mar 6 '11 at 21:56
    
he said it made a difference; others on the internet know about it, but none really seem to know why it's done. I personally don't like coffee, so I've never done a taste test to compare. (and then he'd put both the shells and coffee into the compost pile afterwards) –  Joe Mar 7 '11 at 0:01
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I was always taught the egg shells were good for the pipes, but when our drain clogged, the trap was filled with coffee grounds and egg shells. Perhaps the egg shells would normally be fine, and they only got stuck because of the coffee grounds (which I know should not go down--our guests did not). Even still, after that experience, I now have a policy against egg shells (and coffee grounds) in the disposal.

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Well since I live in a city with a sewer system I pretty much run everything through my garbage disposal. I replaced the 25 year old original with a new KitchenAid and the guy told me I could run just about whatever I wanted through it. I avoid bones and extremely hard substances but egg shells, peels, left over food, it all goes down and gets turned into paste before being washed down into the city sewer system. So I would say it depends on your disposal and the condition of your pipes. If my pipes were older I would probably be more careful about what I put down the drain.

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We live in a major metropolitan area, and I recently replaced our garbage disposer. While it was off I took a look at the pipes under the sink and they were just caked with black rotting gunk inside them. I replaced them with new ones, and since then our cockroach problem seems to have gone away completely. I believe all that rotting crud inside the pipes was a full time food source for the bugs. Used to be if you turned on the kitchen lights at 2am you would see a scurry of activity on the counters. Apparently, now that the food source is gone, they left. Turn on the lights at 2am these days and there are exactly ZERO roaches.

Now we use the disposer for cleaning the scraps off the plates, but that's about it. If there's a large quantity of something that needs to be thrown away, we'll put it in a two Walmart bags and store it in the freezer till trash day.

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I had never had a problem with our disposal until today... the day my wife put eggshells in there. There could probably have been other contributing factors.

I have read multiple debates and the controversy is enough to get me to discontinue the practice. Garbage, compost, chickens, or a giant laser, all seem like better options to me!

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Many years ago my mom had clogged kitchen pipes; after the plumber cleaned it all out, he advised her not to put egg shells, celery or onion skins down the disposal. I didn't know if the disposals had been vastly improved since then, but sounds like items like these are still questionable.

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Biggest no-nos are starches, fats, (Thanksgiving is a plumbers busiest day), proteins, and fibrous vegetables. I live in a city highrise. I do put some egg shells and coffee grinds occasionally. What I do weekly, is put 1/2 cup of baking soda and 1 cup of white vinegar in the drains (disposal and other kitchen drain). Let stand for 1/2 hour or so and follow with very hot water. This is good practice. Also helpful are white vinegar ice cubes. They clean the blades.

I would not put said refuse in a septic system for the same reasons as others gave.

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Growing up my grandma told me that egg shells were good for the garbage disposal. They sharpen the blades. I wouldn't put potato peeling or coffee grounds in it

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