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Re: aragonite

It's fine for adding both KH and GH. The small amounts of other
trace metals Zn, Sr etc are fine.
Get the finest grain size you can for faster dissolving.

I use CaCl2 for adding specifically Ca. It dissolves fast.
For Mg, use Epsom salt. Both of these will dissolve fast and
allow easy fast adjustments of GH independent of KH.

If your GH is less than 3 degrees, about 50ppm, then you will
want to add more Ca, perhaps Mg.
There is no known upper limit for GH that I have found or have
heard of that is detrimental to plants. 500-600ppm, 25GH+ etc.
Not too many places have water harder than that.

Tom Barr


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