Quarla,
The byproduct takes the water out of the biodiesel and settles out, leaving the Biodiesel on top and the byproduct below.

The problem most people would have is that they would not have sufficient room for the 20% byproduct and the 20% water and the biodiesel in the washing tank.

Thue it would be bvest for them to add the byproduct to a sample, increasing the proportion gradually, while stirring, until the emulsion broke. This would give them the volume needed for their batch. They may need to drain off some of the batch to make room. This could be dealt wth later, after the majority has been recovered.

I hope this helps,
Tony

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