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Generally speaking, it’s absolutely worth it to repair a garbage disposal, so long as it’s eight years old or younger. Once you pass that eight-year threshold, it depends on the issue. If it’s a simple jam and the core components remain unaffected, call a local plumber for a quick repair. If it seems like the motor is wearing down, spring for a replacement unit. 

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. 

The most common garbage disposal size in the U.S. is 1/2 horsepower. This size is ideal for households with three or fewer people or those that don't produce much food waste. Although 1/2 horsepower can't handle the typical food waste load for a household of four (which is about 250 pounds of food waste annually) as effectively as 3/4 horsepower, it remains the most common size of garbage disposal on the market.

Soil is just one of the items you shouldn't put down a garbage disposal. Garbage disposals are only meant for soft, non-fibrous foods. Large amounts of topsoil, dirt, or rocks will damage the blades of your garbage disposal or clog the pipes. If a small amount of dirt goes down the drain as you repot a plant, you shouldn't have to worry, but never dump a whole pot of soil in the sink for fast disposal.