Hillbilly Stills Activated Carbon is A premium grade of Activated Carbon made from Stone Coal. It is much cleaner (not as much dust ) than most Activated carbon. Stone Coal activated carbon filtration is suggested for a pure, neutral spirit. Not suggested for filtering product where residual flavor is desired, such as Whisky, Rum, or Schnapps. this is a 12×40 Mesh carbon. This will clean the spirit very nicely.