Also known as GRU, an electric grease trap is a type of interceptor which uses heating. A heating element is used to liquefy fats, oils and grease which then rise to the surface. The FOG is then transferred into a dedicated receptacle. The residue has to be removed by the staff and emptied into a bucket for later collection by a waste disposal contractor. These kinds of interceptors are usually installed indoors. GRUs are typically set up under sinks. The solutions of this type require daily cleaning as well as maintenance.