Abstract: A grease separating system includes four successive chambers. The heated, emulsified grease is passed through a solids retention box into an inlet chamber where cool water is sprayed onto the emulsified grease. This mixture is passed through a connecting chamber, and then over baffles at the entrance of a collection chamber. The grease having been separated from its emulsified state rises to the top of the mixture in the collection chamber, and the water passes into a discharge chamber and in to the connected sewer system. After successive operations, the floated grease is sensed when it reaches a predetermined level, and an alarm is sounded to indicate that the accumulated grease should be removed.