What can be seen in the video is the refining tank and its internal details of the 2-ton production cold-filtration refining equipment, which includes low-temperature cold filtration, dephosphating, deacidification and dehydration steps. The low temperature cold filter tank is equipped with coil and stirring, the wool oil is fully reacted at low temperature, and the dephosphate and deacidification refining tank to remove harmful substances, and finally remove water in the sealed dehydration tank.