Plants can be used to treat used cooking oil:
1. Pretreatment: Eliminating most of miscellaneous articles or objects in the used cooking oil.
2. Elementary filtration and refining filtration: Removing impurities quickly and thoroughly (not bigger than 10 um, even 5 um).
3. Dehydration: Removing most of the water in the cooking oil (not more than 1%).
4. Also can decolorize the used oil from black or deeply brown to white or clean. 

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