... fuel, after that, it begins to produce the waste gas, you can use the waste gas as fuel, save your cost.B) The whole ... cooling pool)Oil store system(oil tank, glass mirror, liquidometer)Waste gas recycle system(water seal, combustable gases burner, spray gun, ... cooling pool)Oil store system(oil tank, glass mirror, liquidometer)Waste gas recycle system(water seal, combustable gases burner, spray gun, ...