Burton Water Salts - A blend of natural minerals designed to harden your water for brewing. This product contains a balance blend of calcium sulphate, magnesium sulphate, and sodium chloride, and is designed to help you recreate the water profile of Burton-on-Trent. It also has an organic compound call papain. It is included to help prevent beers from forming a haze when chilled. Each packet is enough to treat 5 gallons of water. | E. C. Kraus Home Beer Making Supplies