... there is no odor and no environment pollution. HCY Heating device are optional, there are oil-burner furnace, natural-gas furnace ... will produce different density diesel fuel oil. 2, HCY Heating device are optional, there are oil-burner furnace, natural-gas ... can be used again , Silica recovery ratio above 97%6. Activated carbon recovery ratio above 95%Technical Data: SpecificationsUnit \ TypeHCY-2HCY ...