Why is a minimum capacity of 1000 gallons specified for grease traps?

A minimum capacity of 1000 gallons is specified for grease traps primarily to ensure effective grease separation. Grease traps are designed to intercept fats, oils, and grease (FOG) from wastewater before it enters the sewage system. The larger capacity allows for a sufficient volume of wastewater to flow through, which enables the grease to rise to the surface and be trapped while the water continues to flow out.

This design relies on the principle that FOG is less dense than water, allowing it to float. A trap with inadequate capacity would not effectively separate and retain the grease, leading to potential clogs in the plumbing and sewer systems, environmental issues, and violations of health regulations. Therefore, the specified 1000-gallon minimum is critical to achieving the desired performance and maintaining the overall function of the grease management system.

Other responses may deal with regulatory compliance or plumbing system needs, but they do not focus on the core purpose of grease traps, which is ensuring proper separation of grease, making effective grease separation the key reason for the minimum capacity requirement.