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RE: Aquatic Plants Digest V3 #1019



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. 

                         281621
                                                        WATER SOFTENER

$4.25