Certainly not a pretty thing, but posted by the city of Yankton, SD. "Most fat that is poured down the drains is in liquid form, but when it hits the cold pipes underground the grease hardens on the walls of sewer lines. A popular myth is that running hot water down the drain will prevent this from occurring, but the ground surrounding the pipe keeps it cool, allowing the fat to cling to the walls of the pipe. Over a period of weeks or months the fat will harden in the pipes, eventually causing the pipe to become completely blocked. Sometimes these blockages can cause sewage to back up into your home or your neighbor’s home causing hazard and inconvenience to the inhabitants. Instead of pouring fats down the drain, allow to cool and solidify, then scrape it out and dispose of it in your household trash."
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