Cask ale is unfiltered and unpasteurized. Traditionally cask ale is also cask-conditioned, undergoing a secondary fermentation in the cask. This contrasts with “keg beer” which is generally filtered and carbonated. Cask-conditioned beers are also referred to as “real ales”. It is common in Canada to find cask dispensed brews that are racked off from a larger batch of beer that is destined for filtering and packaging. These racked cask beers do not undergo secondary fermentation but will often have additional hops or other ingredients added to infuse additional flavours.