A grease interceptor is much larger than a grease trap and is usually located in a vault outside of the establishment. The minimum size is 750 gallons. It too should be cleaned on a regular basis, however, a licensed grease hauler or recycler should perform grease interceptor maintenance. Cleaning the interceptor vaults requires special training and equipment. It is very important that a restaurant representative be present during any cleaning, pumping, or skimming performed by a contractor to ensure that no shortcuts are taken.  The minimum services should incluide:
- Complete pumping and cleaning of the interceptor and sample box (not just skimming the grease layer).
- Deoderizing and thorough cleaning of affected areas, as necessary.
- Disposing or reclaiming of grease and oil at an approved location.
- Refilling the vault with clean water (not water already pumped out).
The cleaning frequency depends on the individual establishment. Interceptors require cleaning at least every six months. However, frequency depends on the capacity of the device, the amount of grease in the wastewater, and the degree to which the facility has contributed to blockages in the past. Thus, the frequency can range from every two weeks to every six months. | 
