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Re: Aquatic Plants Digest V4 #436

I doubt there is any need to worry about impurities, but rather consider that 
there are two different salts here.  One is sodium chloride and the other 
calcium chloride with different chemical properties.

 Date: Wed, 26 Jul 2000 17:42:57 -0400
 From: "heinesen" <heinesen at idirect_ca>
 Subject: Cheap salt
 But...don't these salts, especially the road deicer, contain lots of
 impurities?  That's what I've always heard, although I must admit, I don't
 know whether those "impurities" would harm fish.
 Gitte >>