What are the types of hardness of water?

The process used for the removal of hardness of water is

What are the advantages of (i) soft water (ii) hard water?

The reagent(s) used for softening the temporary hardness of water is (are):

What do you understand by hardness of water? Describe the permutit and calgon processes used to remove the permanent hardness of water.

What do you understand by the hardness of water and what are the causes of hardness ?

The reagent which is not used for removing the permanent hardness of water is :

The method used to remove temporary hardness of water is:

The degree of hardness of water is usually expressed in terms of

In Clark's method the chemical used to remove hardness of water is