I am a Science teacher in Kansas City. I have my classes currently investigating constructing a Biodiesel Processor. I would like to use a recirculation pump as a mixer, using a hot water heater as the processing tank. In Ian's vacuum biodiesel processor what type of pumps did he use for mixing or what type of pump would work best? I am unsure of what pump would work best if any, due to the high viscosity of oil. And what size vacuum pump was used for recycling the methanol. Thank You Rodney
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