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I have some but have only used a small amount of it. My kalk reactor and water changes maintain my alk and ca levels for the time being. The directions state that it is for use in recirculating aquaculture systems, so I would think that it is safe and have seen no ill effects when I did use it. I was planning to use it when my alk and ca demands increase to more than my kalk can provide. If CaCl is going to be difficult to obtain I may buy a Ca reactor.
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