Hi all, I am new. I have followed the posted search links - very informative. The formula to calculate dGH = (ppm Ca * 2.5 plus ppm Mg * 4.1) / 17.9 is clear.
What about calculating gKH in reconstituted water using baking soda? By analogy this would be = ppm NaHCO3 * 1.2 /17.9. But is carbonate hardness defined only by a concentration? Should I account for the fact that HCO3 ion has only one negative charge, while CO3 has two? If yes, then I need to divide this by 2 to get the right answer.