Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of_____________________?
Correct answer: D. Sodium chloride
- A. Calcium sulphate
- B. Magnesium chloride
- C. Sodium sulphate
- D. Sodium chloride
Explanation
A zeolite softener is regenerated with concentrated sodium chloride brine. Sodium ions replace the calcium and magnesium ions held by the exhausted zeolite, restoring its exchange capacity.
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