Grease traps are required for any business that generates more than 10 gallons of fats, oils, and grease (FOG) per week. Grease traps are used to separate FOG into three phases: floating, dissolved and emulsified. The floating portion can be easily skimmed off to be used as animal feed, the dissolved portion can be filtered out, and the emulsified portion is pumped to the sewer. This is how the grease trap cleaning works: the customer places an order in your San Francisco Grease Trap Cleaning store and pays you the amount. After that, you will need to schedule an appointment with your company. You will then schedule a time to come out to their location and then do the work there.