Weak acid cation exchanger is a vessel in which an ion exchange process takes place. H⁺ ions replace the cations present in TDS to produce decationised water. Calcium (Ca), Magnesium (Mg) and Sodium (Na) ions which are present in the form of carbonate and bicarbonate salts gets converted into their equivalent acids. WAC units are used to remove cations associated with alkaline.

In demineralization it is used in conjunction with SAC resin when alkalinity and hardness is both high in raw water. In such cases, the "spent" regenerant from the strong acid cation unit can be used to regenerate the weak acid cation unit. The higher regeneration efficiency and exchange capacity of the weak acid cation resin over the strong acid cation resin makes the former resin more economical for use in waters having high percentages of hardness and alkalinity. It is suitable for both manual and automatic operation.

APPLICATIONS:

1. Weak acid cation unit is used for demineralization and dealkalization of water.
2. Water softening or dealkalization