(NUT450) This is a specially designed mixture of nutrients and foods for pre-starting your beer yeast ahead of time. Starting your beer yeast in advance allows the fermentation to take off much more quickly and finish more quickly, resulting in a more stable and cleaner tasting beer. Very effective when producing lighter beers where a crisp, clean flavor is a necessity to the style. Each package makes a yeast starter sufficient for up to 6 gallons of beer. Come with complete directions.