1 to 4 people. 4 cubic meters grease trap is suitable for small restaurants and canteen places for oily sewage treatment. When using the 4 cubic grease trap, 1 to 2 people are needed to operate it, responsible for the work of introducing the sewage into the grease trap and cleaning the impurities in the tank. In large catering enterprises, 3 to 4 employees are required to cooperate with the use of 4 cubic grease trap, sewage discharge, cleaning work.