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Might be worth you reading this
Water softening - Wikipedia, the free encyclopedia
"The water to be treated passes through a bed of the resin. Negatively-charged resins absorb and bind metal ions, which are positively charged. The resins initially contain univalent (1+) ions, most commonly sodium, but sometimes also hydrogen (H+) or potassium (K+). Divalent calcium and magnesium ions in the water replace these univalent ions, which are released into the water. The "harder" the water, the more hydrogen, sodium or potassium ions are released from the resin and into the water.
Resins are also available to remove carbonate, bi-carbonate and sulphate ions which are absorbed and hydroxyl ions released from the resin. Both types of resin may be provided in a single water softener."
The salt you put into the softener is used to regenerate the resin bed i.e. puts sodium ions back onto the resin
Water softening - Wikipedia, the free encyclopedia
"The water to be treated passes through a bed of the resin. Negatively-charged resins absorb and bind metal ions, which are positively charged. The resins initially contain univalent (1+) ions, most commonly sodium, but sometimes also hydrogen (H+) or potassium (K+). Divalent calcium and magnesium ions in the water replace these univalent ions, which are released into the water. The "harder" the water, the more hydrogen, sodium or potassium ions are released from the resin and into the water.
Resins are also available to remove carbonate, bi-carbonate and sulphate ions which are absorbed and hydroxyl ions released from the resin. Both types of resin may be provided in a single water softener."
The salt you put into the softener is used to regenerate the resin bed i.e. puts sodium ions back onto the resin
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