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> Date: Tue, 11 May 1999 09:51:58 -0700
> From: KAnderson at psg_ucsf.edu
> Subject: RE: Aquatic Plants Digest V3 #1019
> 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. 
>                          281621
>                                                         WATER SOFTENER
> $4.25

Judging from the description and price, it is most definitely a sodium
ion exchanger.  The fact that you recharge it with aquarium salt is a
giveaway as well.

And it makes "silky soft" water?!  Who writes this stuff anyway?  Rejects
from a laundry detergent ad company?