Washington DC 3rd Class Boiler Practice Test

What does a zeolite water softener system use as a means of regeneration?

Brine Heat Electricity Air

Correct Answer:

Brine

Explanation:

Zeolite water softeners rely on ion exchange: the resin beads are loaded with sodium ions and swap them for calcium and magnesium in the water. When the resin becomes saturated with hardness minerals, regeneration uses a brine solution—salt dissolved in water. The high concentration of sodium ions in the brine drives the exchange, releasing the calcium and magnesium from the resin and replacing them with sodium ions, with the hardness ions flushed away to waste. Heat, electricity, or air don’t regenerate the resin in this setup; regeneration is a chemical exchange driven by the brine. Some systems may use potassium chloride as the regenerant, which is still a brine-based regeneration.

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