Can be used to acidify the mash or sparge water. In general, you should add the minimum needed to achieve your target pH. Lactic Acid blends very well with beer and will not add any unwanted flavours, it will add lactates. It is also used in many Belgian styles to sour the beer. When making sour beers without the means or the desire to use the live organisms and alternative is to add lactic acid when the beer is finished. Comes in a handy measuring container making it easy to measure small amounts.