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Re: Salts (Epsom)

Matthew Mason asks about hardness salts
Epsom salt = Mg2SO4 * 7H2O
No calcium which is one of the important ingredients in hard water for
plants. It's fairly soluble. Use some of this together with calcium 
chloride which is also soluble if you don't like waiting for calcium
carbonate to dissolve. Why do you object to carbonate?