Olej to, przeczytaj choćby to: GBA-water-primer.pdf"Individual Ions: You are almost ready to design your own water profile but first lets go over the individual ions and their acceptable concentration ranges.
Calcium (Ca2+): minimum 50-100 ppm, over 150 probably too much. Ca is important for hardness, mash pH, and yeast flocculation (beer clarity).
Magnesium (Mg2+): 10-20 ppm. It is important for yeast health but some argue enough comes from the malt. Too much leads to harsh bitterness (>50ppm).
Bicarbonate (HCO3-): 0-50ppm for light colored beers, 50-150 for pale ales, amber, browns; 250-300 is for dark browns and stouts, never go above 300 ppm.
Sulfate (SO42-): 50-150 ppm in normal bitter beers, 150-300 for IPAs and other highly bitter beers
Sodium (Na): 0-150 ppm, sodium is not that important in its own right
Chloride (Cl-): 0-250 ppm, useful to round out the malt character."
pobawisz się wodą to dojdziesz do wniosku, że te tabelki z profilami z różnych miejsc to lekko mówiąc ściema trochę jest. Wodę korygujesz tak, aby osiągnąć to co chcesz w piwie.