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K Anderson writes:
> Does this exchange calcium and magnesium for sodium or H and HO ions?
> WATER SOFTENER
> Convenient unit makes hard water silky soft in just a few hours.
> Contains key resins essential for removing calcium and magnesium. Simply
> connect an air line
> to the unit's air stem assembly and place in the aquarium. One
> unit softens up to 30 gallons of water. Easily recharged for reuse with
> aquarium salt.
Water softeners replace Ca and Mg ions with Na ions. De-ionizers (some of
them at least) will replace metal ions with H+ ions.