Triple Interceptor: A Triple Interceptor is also known as a Food and Oil Interceptor or Grease Trap. It is a tank installed between a sink and a public sewer to prevent pollution from trade waste such as grease, fat, oil, silt, sand, sludge and other substances entering into the sewer system. A grease trap has a number of baffles that slow the flow of warm/hot greasy water allowing the water to cool. … Continued