I have a questions I have a 55 gallon drum and it spins
16 rpm is that to fast and how much corn cob dust do you
put in there
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...sorry, it just sounded like a math problem from junior high... The RPMs are fine. As for how full, you'll get lots of opinions. I keep mine @ 2/3 full which I believe is about 2 1/2 bags of grit.