How to determine calcium level in water
Calcium, Titrimetric Method (0-200 ppm as CaCO3 )
The determination of calcium in a water analysis is closely allied to the determination of hardness, since hardness is caused primarily by the presence of calcium and magnesium.
Under certain circumstances, determination of calcium is made so as to subdivide the total hardness into calcium hardness and magnesium hardness. The total hardness minus the calcium hardness equals the magnesium hardness.