Diagram showing yeast sinking, CO2 Rising and sediment gathering Why 3 days? Day 1 perfect, Day 2/3 satisfactory, Day 3 onwards deteriorates rapidly
  • Air drawn into the cask contains oxygen.
  • This will allow oxidation of the beer to take place and cause spoiling.
  • If the cask is not emptied within three days this spoiling will become noticeable to the customer.