GREASE TRAPS 101
What is a Grease Trap?
A grease trap or grease interceptor is a receptacle located between the restaurant drain lines and the sanitary sewer lines that allows for the separation and collection of fats, oils and greases (FOG) from the used water, preventing such materials from entering the municipal sewer system.
The grease trap can either be located inside of the establishment or on the outside. Typically large restaurants or school kitchens will have their grease trap/ grease interceptor located outside of the facility, usually in the ground, while facilities with smaller traps can usually house theirs indoors.
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How does a grease trap work?
Grease traps slow down the flow of water coming from drains, allowing the water/ grease time to cool. This cooling causes the grease to coagulate and float to the top, while other, heavier solids, fall to the bottom of the trap. The remaining water is free to pass through on to the city sewer lines
A grease trap works with hydraulic pressure and gravity. When you empty your three compartment sink, the water flows into the grease trap.
It then hits a baffle which slows down the water. This allows the solids to sink to the bottom of the trap and the fats and oils to float to the top.
The water pressure from the incoming side then pushes the water that has had time to settle out of the trap and into the sanitary sewer line or the septic system.