Just as fat accumulates and causes blockages in human arteries, oil and grease solidifies and accumulates in household pipes, restricting the flow of wastewater and causing sewer backups and overflows.
Fats, Oils, and Grease (FOG) include animal and vegetable oils/fats used to cook and prepare food. Examples include cooking oil, butter, lard, shortening, margarine, gravy, sauces, meats, sour cream and mayonnaise.