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Replacing a garbage disposal costs anywhere from $150 to $950, but the average cost is somewhere around $550. There are two types of garbage disposal units, and continuous feed disposals tend to cost more than batch feed disposals. Going for an aluminum garbage disposal is also significantly cheaper than choosing a stainless steel garbage disposal. You'll also need to factor in the horsepower of the motor, labor, and the removal and disposal of your old unit.

Garbage disposals fit the drains of nearly every sink out there due to universal drain hole sizes of 3 1/2 to 4 inches, but the same isn’t true for the housing underneath the sink. You need plenty of room to fit a garbage disposal under there, so measure the space ahead of time and use those dimensions when shopping for a new model. If you’re replacing an existing model, get one in that size.

Regular maintenance, such as not disposing of grease or coffee grounds down the sink and routine use of strainers, can prevent clogs.

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.