Highland Cask Strength Whisky: These Malts have had no water added since being placed into cask following-distillation. Their strength can vary with time in the cask due to being stored in either a dry or a damp atmosphere. Cask strength Malts have greater concentration than standard strength and many aficionados will add a touch of water to achieve the correct balance of power and flavour. Many of these Malts have not been chill filtered and thus retain all their natural elements, they may go cloudy if chilled or throw a slight sediment with age.