Hardness – Kewujudan Calcium dan Magnesium (dan mungkin iron, aluminium, manganese
CLASSIFICATION | Carbonate hardness | Non-bicarbonate Hardness |
Calcium hardness | Calcium Bicarbonate Ca(HCO3)2 Calcium Carbonate CaCO3 | Calcium Sulphate CaSO4 Calcium Chloride CaCl2 |
Magnesium Hardness | Magnesium Bicarbonate Mg(HCO3)2 Magnesium Carbonate MgCO3 | Magnesium Sulphate MgSO4 Magnesium Chloride MgCl2 |
