WATER HARDNESS

Hardness dipecahkan kepada Carbonate dan non-carbonate hardness
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