Question

state the disadvantages of using hard water

Answer 1

It will difficult to form a lather with soap

Answer 2

Bathing:

Hard water does not lather freely with soap solution, but produces sticky scum on the bath-tub and body. Thus, the cleansing quality of soap is depressed and a lot of it is wasted.

Cooking:

Due to the presence of dissolved hardness-producing salts, the boiling point of water is elevated.