FOG stands for fats, oils, and grease. FOG can buildup and clog sewer and drainage pipes unless properly pretreated. Restaurants and food service facilities generate greasy water through cleaning and washing dishes. Approved grease interceptors are installed in all food producing facilities to capture FOG before it discharges to the public sewer. For interceptors to be effective, proper pump out service and regular inspections must be completed. Industrial Pretreatment monitors food service establishments to ensure they are effectively managing FOG.