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If my memory is correct he was using it for smell, probably at a much lower PPM – but either way I think you’re right that he had it running in the grow room, or maybe into the exhaust.
ohigrow and myke_o_breal -
I believe @scottyreal mentioned he used it back in the day on a recent episode. Sounds effective but it messes with your sense of smell. He said he has a hard time smelling weed now. 😟
myke_o_breal and lab_grade