Still Spirits Pure Turbo Yeast (Urea Based) 110g Makes 15% ABV Pure Turbo should be used where ultimate alcohol quality is of primary importance. This is a revolutionary breakthrough in Turbo Yeast development making it possible to produce Triple Distilled quality alcohol in the home - where allowed. MAXIMUM Temperature 24C (75F). Only use where cool air temperature (between 18C-24C) can be maintained. If you can't maintain this temperature, select a different Turbo Yeast! Always use Turbo Carbon with Triple Distilled Turbo Yeast.