A concentrated solution (commonly2% to 10%) that is capable of reversing the ionexchangeequilibrium by the principle of massaction. Example of a typical regenerant is a 10%sodium chloride (NaCI) solution used to displace thecalcium (Ca++) and magnesium (Mg++) hardnesscations picked up in the sodium cycle cationexchanger (water softener) and replace them withsodium (Na+).
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