Chill haze is caused when proteins and tannis (polyphenols) bind together and become insoluble during cold storage. Clarity Ferm prevents chill haze by breaking down the proteins involved thus preventing protein/polyphenol complexes from forming. Clarity Ferm also significantly reduces gluten content in finished beer. Treated beers usually test below 20ppm gluten, the current gluten free standard. Each vial contains 10mL of Clarity Ferm - enough to treat one 5 gallon batch of beer. Simply add to cooled wort when pitching yeast.