Calgon is

The Reagent which is commercially known as ‘calgon’ that is used to remove the permanent hardness of water in Calgon’s method. Find out the number of moles of calgon required to remove 12 moles of Ca^(2+) ion present in hard water.

Calgon used as water softener is

Calgon used as water softner is

Calgon used as a water softner is