
- Water softening resin are cation exchange resin with Na+ as the primary ion. The hardness of water is caused by the presence of Ca2+ and Mg2+ ions.
- There are various methods for water softening, among which using ion exchange resin proves to be the most effective.
- The process involves exchanging Ca2+ and Mg2+ ions with Na+ ions:
==> This is the process of "water softening."


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