Why is artificial permutit preferred to natural permutit for softening water?
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A permutit is packed into the reservoir from which the hard water is allowed to pass. When the water passes through the permutits, exchange of ions takes place i.e. Calcium and Magnesium is replaced by the Sodium and Aluminium.
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Sodium permutit is slowly changed into calcium and magnesium permutit, and the water becomes soft with the removal of calcium and magnesium ions. When no longer active, permutit is regenerated by running a concentrated solution of brine over it and removing calcium chloride formed by repeated washing.
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