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No, you don’t need a garbage disposal for a dishwasher. A dishwasher will work without a garbage disposal. However, the two appliances pair well and are often installed together. It is rare to see a home with a dishwasher that doesn’t have a garbage disposal, but that doesn’t mean it's not possible. Each appliance serves its own purpose. 

Garbage disposals last an average of about 10 years, so it may be time for a new model if it's getting up there in age. Other signs that it's time to bring in a local garbage disposal pro include:

• Leaks under your disposal

• Persistent clogs

• Lingering odors

• Lack of power

• Unexplained noises

In some cases, it’s more cost-effective in the long run to replace a garbage disposal, but it depends on the specific issue you’re having and the age of your disposal. You should ask a garbage disposal repair tech for a quote to repair your appliance and then see if it would be more worthwhile to replace it. Additionally, garbage disposals last for around 15 years, so if you know your appliance is reaching that age, it’s likely better to pay for a new garbage disposal rather than sink money into repairs.

These appliances certainly increase the number of things allowed down the drain, but they’re not foolproof. There are several items you shouldn’t put in your garbage disposal, according to manufacturers and technicians. Don’t put coffee grounds down the drain. The same goes for eggshells, potato peels, hard foods, onion skins, and any dry, expandable food. Most importantly, never put grease or oils down the drain.