Kacerdias
Member
I've done a small test batches, but larger quantities aren't difficult. The trick is not to use too much lye and to be careful when skimming the biodiesel from the glycerine precipitate at the bottom of the container. Glycerine is leftover during the production and you don't want it in your fuel. Now if you're confident enough about the purity of the glycerine you may be able to make soaps out of it, but that's another story.