Clarity Ferm by White Labs - WHITE LABS CLARITY-FERM 10mL SINGLE DOSE FOR 5-7 GALLON. This easy-to-use enzyme can be used on all types of brewing materials and is a cost effective product to replace silica gel or PVPP. Simply add when pitching yeast, and Clarity-Ferm will do its work during fermentation. When fermentation is complete, chill haze has already been addressed. In addition to eliminating chill haze, Clarity-Ferm significantly reduces the gluten content in beers made with barley and wheat. A Clarity-Ferm treated beer made from barley or wheat usually tests below 20 ppm of gluten, the current international standard for gluten free.