Calcium Hardness
Calcium Hardness
Calcium Hardness is the concentration of dissolved calcium ions (Ca2 +) in the water, including dissolved calcium compounds such as:
- Calcium Carbonate (CaCO 3)
- Calcium Bicarbonate (CaHCO 3+)
- Calcium Sulfate (CaSO 4)
Calcium hardness is most often expressed as ppm CaCO 3, because it is a convenient weight measurement converted from a molar measurement. Some water tests show ppm (or mg/L) of Ca2 +. But for the Orenda Calculator™, we use ppm CaCO 3 like most standard swimming pool test kits.
Learn more about calcium hardness here.