Which of the following describes how a grease trap must operate?

A grease trap is an essential component in plumbing systems, particularly in commercial kitchens, where fats, oils, and grease (FOG) are prevalent. The primary function of a grease trap is to separate grease from wastewater before it enters the public sewer system. By allowing grease to float to the surface while allowing cleaner water to pass through, it helps prevent blockages and backups in the plumbing system and minimizes environmental pollution.

The separation of grease is fundamentally important because if grease were allowed to enter the sewer system, it could solidify and cause significant clogs, leading to costly repairs and potential environmental damage. This is why the correct answer emphasizes the separation process as the key operating principle of a grease trap. Regular maintenance is necessary for effective operation, and a grease trap is not typically required to reduce flow rate—its main focus is on treatment rather than alteration of flow dynamics.