I would assume that is a myth. A major brewery like any of the ones operated by AB-Inbev strips the water of any mineral impurities by reverse osmosis before ad

I would assume that is a myth. A major brewery like any of the ones operated by AB-Inbev strips the water of any mineral impurities by reverse osmosis before adding back in the mineral profile they're looking for for that particular brew. (source: tour of AB brewery in Fairfield)