Sure, hot water melts the grease and washes it down the drain. But once the liquefied grease hits the pipes, it cools, solidifies and eventually builds up. The grease is a magnet for food bits, lint and hair, eventually clogging the pipe. And those clogs are so far away you can't reach them with a household snake. Calling in a pro to clear the line will cost you about $150. Cold water, on the other hand, solidifies the grease before it hits the sewer line, so it can float all the way to the city sewer. Cold water also cools the disposer motor, making it last longer. Just hope it doesn't become one of these 100 mind-boggling plumbing goofs people have done in real life.

 

From: https://www.familyhandyman.com 

 

 

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