This topic covers information related to FOG or fats, oils and grease disposal systems that are installed during construction. Fats, oils and grease from residential or commercial kitchens can clog sanitary sewer lines and in turn cause wastewater backups. A plumbing device known as an interceptor is designed to be installed in-line with a sanitary waste line to collect or intercept most fats, oils and grease, prior to their entry into a sewerage system.