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Thanks for taking the time to respond and for the reference. Quick google search says ochem survival manual. I'm guessing that's the one and it's on the way.

Hello Forum, I've been wracking my brain with this question for weeks now and can't seem to find the sweet spot. After winterizing CO2 output in 200 proof ethanol, using a rotary evaporator for ethanol purge/recovery (52C, 27.5" Hg), I cannot get anywhere near some dispensaries 500 PPM residual...