... .Fifth: Sign a formal contractOil Hydraulic Press and small cold oil press machinery: Centrifugal refining ... oil is refined oil, the pot does not overflow the pot, not foam, can direct filling sales ... The filtered oil is still crude oil, pot overflow pan up foam, not direct consumption.3. Transparent ... once, saving time and effort.5. Often slag, slag containing 2% -3%, waste oil, labor intensity.6 ...