I am experimenting using oak chips/shaving to filter my bio diesel. I have a 4 " PVC tube that is 3' tall, filled it 2/3 full with red oak chips. Poured 1/2 gal into it and turned the needle valve on the bottom to just a drip. Let it filter through and did a shake test, seperation was fast and the water was clear. After work today, ran 3/4 gal through at a little faster rate (2 hours per 3/4 gal) and what came out was a nasty brown bio. Any ideas or does anyone on the forum use oak chips?
Dave
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