Public Service Laboratory - Water Softener

Public Service Laboratory

Water Softener

Water Softeners contain an ion exchange resin that exchanges sodium ions (Na+) for calcium (Ca++) and Magnesium (Mg++) ions.  When the sodium is depleted, the resin needs to regenerated.  This is done by backflushing the resin with a concentrated salt (sodium chloride) solution.  Sodium ions displace the calcium and magnesium ions, which are washed down the drain, and the resin is ready for another softening cycle.

Water Softeners

Illinois State Water Survey

2204 Griffith Dr
Champaign, IL 61820-7463

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