A more efficient alternative to the pot still, it is capable of continuous distillation by reheating the liquid, rather than requiring distillation in batches, and can produce higher ABV spirits than pot stills. The device consists of two columns which contain a number of compartments separated by heated plates. The plates are perforated with small holes to permit the upward passage of steam and spirit vapor, which is condensed to become spirits. Often referred to as a continuous still or Coffey still. For more information, see “How To Make Whisky.”