Send it to a lab. That's the only way to be sure. How many passes did you make through the CF? If you have a 55 gallon drum, and a 1 gallon per minute CF System, you would have to run it between 4 and 5 hours to get down to the 1 micron range. Or you can clean your rotor, and run the system for another 30 min. to an hour, and see how much goop still gets pulled out.
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