Grease traps and interceptors both operate in pretty much the same way. The main difference between a grease trap and a grease interceptor is the flow rate of wastewater that each can handle. A grease trap works well with a lower flow volume while an interceptor was made with heavier flow volumes in mind. Grease traps – Less than 50 gallons of grease per minute. Grease interceptors – More than 50 gallons of grease per minute. Grease interceptors are typically found in busy restaurants and grocery stores. For more information on grease traps and interceptors, contact Pro Services online today.