A proprietary blend of food-grade phosphate buffers (similar to brewer's salts) that will lock in your mash and kettle water at a pH of 5.2 regardless of the pH of your water, allowing for more consistent brewing. It is a very easy way to ensure proper mash pH without worrying too much about water chemistry or salt additions. Highly recommended for the brewer who wants a good mash pH but doesn't want to spend hours pouring through books about water chemistry or brewing salts!