I know its nothing to be concerned about for most or all of us, but i see weyermanns is now selling sauergut (sour wort) which i have been making my own for the past year. It is natural biological acidification. https://bsgcraft.com/resources/Product_ ... cation.pdf And for those interested in attempting to clone a few of your favorite beverages ward labs now testing finished beer. https://www.wardlab.com/brewers-services.php The analysis could help you in water and recipe building . Just food for thought.