Popularized in the '70s and '80s, garburators are starting to go out of style. A banana peel or last night's dinner can increase the load on city sewage systems, putting an extra strain on treatment plants. Some cities, like Guelph, Ontario, have banned garburators for this very reason.
Retiring your kitchen garburator means you won't waste energy every time you flip that switch and you won't waste a huge amount of perfectly good drinking water either.
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Backyard composting is a much better solution from an environmental perspective, and it will save you money on your utility bills. Of course, either option is preferable to throwing organic waste into the landfill.