Describe the operation of a grease trap and the maintenance procedures required to ensure its effectiveness.

A grease trap, also known as a grease interceptor, is a plumbing device designed to separate fats, oils, and grease (FOG) from wastewater before it enters the sanitary sewer system. The operation of a grease trap relies on the principle that FOG is lighter than water and will float to the surface. Wastewater from sinks, dishwashers, and other kitchen equipment flows into the grease trap. The trap is designed to slow down the flow of wastewater, allowing the FOG to separate from the water and rise to the surface, where it forms a layer of grease. The water, now relatively free of FOG, flows out of the trap and into the sewer system. The grease is retained within the trap. Maintenance procedures are required to ensure the effectiveness of the grease trap. Regular cleaning is essential. The grease trap must be periodically emptied to remove the accumulated grease. The frequency of cleaning depends on the size of the trap and the amount of grease generated. A common rule of thumb is to clean the trap when the grease layer reaches 25% of the trap's liquid capacity. Proper disposal of the removed grease is required. The grease must be disposed of in accordance with local regulations, typically by a licensed waste hauler. Inspection of the grease trap is also important. The trap should be inspected regularly for leaks, cracks, and other damage. The inlet and outlet pipes should be inspected for clogs. Maintaining records of cleaning and inspections is essential for demonstrating compliance with regulations. Following these maintenance procedures ensures that the grease trap effectively prevents FOG from entering the sewer system, preventing clogs and sewer overflows.