Burton Water Salts are used to harden brewing water. Hard waters are typical when brewing some all-grain pale ales. Burton Salts is a blend of minerals including gypsum, potassium chloride, and Epsom salts, intended to imitate the brewing water in the English city of Burton-on-Trent. The addition of Brewing Salts helps to control the chill haze in the finished beer. 9 grams is sufficient for a 5 gallon batch. Add to the water when mashing for all-grain brewing, or just before the boil.