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

Calcium sulphate
Sodium chloride
Magnesium chloride
Sodium sulphate

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Chemical Process
Nylon 66 is so named because the

Number of nitrogen atoms between two carbon atoms are 6
Number of carbon atoms between two nitrogen atoms are 6
Average degree of polymerisation of the polymer is 1966
Polymer was first synthesised in 1966

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