I have been looking at brewing with RO water. I have the Book "Modern Homebrew Recipes" by Gordon Strong, most of the recipies call only for a tsp of CaCl (Calcium Cloride) and a few get CaSo (Calcium Sulphate) also. This seems like some minerals are missing when I do a water calcualtor. Please explain how this works and, if anyone has used this to brew a beer and how it turned out.