Chemical Process
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

Magnesium chloride
Sodium sulphate
Sodium chloride
Calcium sulphate

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Chemical Process
Comparing sulphate process with sulphite process, we find that __________ in the later.

Both temperature & pressure in the former is less than that
Temperature is more in the former whereas pressure is more
Pressure is more in the former whereas temperature is less
Both temperature & pressure in the former is more than that

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