@Uday Prasad: Total Hardness ...
Published by JOHN THOMAS, Alef Eco Consulting LLP, Founder & Director
@Uday Prasad: Total Hardness permissible as per CPHEEO Manual is 200 mg/l as CaCO3. Checking for Ca+ and Mg+ maybe used for validating the Total Hardness reported. Alkalinity would be another interesting parameter which would give you an idea of Carbonate Hardness aka Temporary Hardness.
Total Hardness = Temporary Hardness + Permanent Hardness
Temporary / Carbonate Hardness can generally removed by boiling water.