Re: [APD] Re: CaCl2, CaSO4.

["S. Hieber" <shieber at yahoo_com>]

And calcium sulfate (gypsum) does not affect pH or
alkalinity levels of the water. However, note that some
calcium sulfate is not "mined" but is produced as a
by-product of the manufacture of phosphoric acid, in which
case it can have some some residual acid, which can lower
the pH. If in doubt, take some water with a known pH and
dissolve some of the calcium sulfate in it and then check
the pH again.

I believe it was David Lass that first clued me in re
calcium sulfate.


Good luck, good plants, good fun,
Scott H. 
 

--- Thomas  Barr <tcbiii at earthlink_net> wrote:

> 
>  "Regarding 
> calcium chloride, I experienced trouble both times I used
> it. Red plants 
> turned greenish, spotted leaves loosed contrast, stunted
> grow. It took some 
> weeks to recover.
> 
> Mariano"
> 
> Try CaSO4, gypsum, fine ground. This will not have the
> same impact but is slower to dissolve.
> 
> Regards, 
> Tom Barr
> 
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> Aquatic-Plants mailing list
> Aquatic-Plants at actwin_com
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> 


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