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Filtering tanks. I pump finished/washed BioDiesel into the top tank from the wash tank via the processor's pump. I let it settle for at least a week. Lower side bung has a sight tube going up so I can monitor the level of oil in the top barrel. Just downstream from the sight tube is a sediment/water drain. Further downstream is a ball valve then a filter. The bottom barrel has a 12v pump with inline filter to pump BD back up to the top barel, or out to the final storage barrel (on the hand truck) The funnel holds a 5/1 filter sock for final filtering.