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Re:water softener

K Anderson writes:

> 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. 

Water softeners replace Ca and Mg ions with Na ions.  De-ionizers (some of 
them at least) will replace metal ions with H+ ions.

Bob Dixon