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Re: [APD] Calcium Carbonate question

I believe Vaughn Hopkins wrote this email section below:
> Calcium carbonate will only raise the GH if it dissolves in the  
> water.  (Isn't that profound?)  So, if you dump in a tsp of it and it  
> just settles in the substrate to dissolve very slowly as it tends to  
> do, the GH wont change at all.

Thanks Vaughn.
I suspect that is the reason.

Stuart Halliday
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