Hello everybody! I'm new here, I had already tried some extractions and when I found this forum identified with you, since in my forum here in Brazil feel a danger and no one wants to talk about it! As I said I am Brazilian and I speak Portuguese, I understand with imglês read but not write in your language, so I use the Google translator, if any phrase has no meaning I will try to correct writing otherwise. I want to first make a simple tip about filtering with filter paper, "wet with a few drops of propylene glycol just to let damp and so not absorb your statements." Now that gave the hint I will ask a question that may seem stupid, 'What is PGA.