Answer:
Its true
Step-by-step explanation:
It is common for restaurant owners to request their staff members to proceed and drain the used cooking oil into the sewer pipes via the kitchen drain. What restaurant owners don't know is that they have escalated the problem. When cooking oil is deposited into the kitchen drain, it does not flow like water.
this is what go0gle said also..
Do not pour cooking oil, pan drippings, grease, salad dressings, or sauces down the sink. Do not use cloth towels or rags to scrape plates or clean greasy or oily dishware. When you wash them, the grease will end up in the sewer. Do not run water over greasy dishes or pans.
another g0ogle answer .-.