JohnTheBrewist
Well-Known Member
I see a lot of people talking about using distilled/RO water. I always thought that was a bad idea, because the disolved minerals will affect the taste and mouthfeel of the beer, and RO/DI water has no minerals at all. After a quick look, I found a couple of articles.
http://www.beer-brewing.com/beer-brewing/brewing_water/minerals_brewing_water.htm
http://www.beer-brewing.com/beer-brewing/brewing_water/mineral_salt_adjustment.htm
http://www.brew-monkey.com/articles/waterarticle.php
Water chemistry is very important in brewing. That's why I recommend using RO/distilled water for extract brewers. The maker of the extract has already determined the proper water profile, and the necessary mineral content is already in the extract. By using your local tap water, you're including minerals and salts that are not intended for the recipe. In some cases this won't be noticeable, but in others it can make a big difference.
I'm an AG brewer and use deionized water and build my water profile from there. My tap water is very hard so I don't even bother with it.