Interested in some of the science associated with reducing alkalinity in brewing liquor via the addition of acid? Then you may be interested in my latest homebrewing related article, Sparge Water Acidification. This article discusses why low alkalinity water is desirable for use in fly sparging, and how the addition of acid can be used to reduce the alkalinity to acceptable levels. Equations are provided that allow the homebrewer to calculate the amount of acid needed, although for the less adventurous, these equations are implemented in my brewing water workbook, MpH Water Calculator.
Happy brewing y'all, and cheers!