We have drinking water with the following values:
Calcium mg/l 62.7
Magnesium mg/l 10.3
total hardness 7.) dH 11.1
Total hardness 7) mmol/l CaCO3 1,99
Carbonate hardness °dH 8.5
Hydrogen ion concentration (pH-value) - 7,8
To use the water for my plants, I reduce the pH with phosphoric acid to 6.8 PH. If I now want to find out how many calcium and magnesium ions are in the water, do I only need to read out the amount of calcium / magnesium that are listed or must the calcium from the total hardness / carbonate hardness be added too, since it was present in the form of CaCO3 / Ca(HCO3)2 and not as ions before I brought the pH Down.