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On Tue, 11 May 1999, KAnderson wrote:

> Does this exchange calcium and magnesium for sodium or H and HO ions?
>       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.

If it's recharged with aquarium salt then it will exchange
calcium and magnesium for sodium.

Roger Miller