Originally Posted by
97biostroke
Well we might be slightly outdated or off, but when we were taught a couple years ago by a U of I professor he told us if we could see the bottom of the tank through the fuel perfectly (clear as water) it was ready to run in our trucks.
By the way (and I meant to bring this up earlier), when I am at the final wash, and the bio is settling prior to transfering to drying tank, I can look down into my wash tank and see clear down through the bio to the water layer. Clear as a bell through a few wisps at the interface layer, I can easily see my bubble ring and heating element. And as clear and sparkling as it is, I am 100% sure that biodiesel is quite wet.