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« on: February 13, 2013, 08:26:02 am »
Like others have said, some, if not most, RO waters you buy from a grocery store exchange system do have minerals added for flavor. Before making any adjustments, I went to the manufacturer of the particular brand that is available to me here in Suffolk, VA where my water is REALLY bad. They informed me that their mineral additions were proprietary and they could not release the actual mineral content. I found this troubling, because I wanted to know what I would be ingesting. At that point I wrote them off and decided to go distilled just because I know what is in there and have a consistent baseline, which will make the process repeatable.
I am not sure if anyone else has ever had a similar experience trying to obtain a water report from a company producing RO water. I could have simply sent a sample to Ward Labs, but the cost of the test IMO was better spent on distilled water that I could brew with and have confidence of the mineral content.
FWIW, since I started building my water from distilled and getting a little friendly advice from the folks on the forum, my beer has become much better. These guys know their shiznit!