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How can I add calcium without raising PH?

5K views 6 replies 4 participants last post by  Edward 
#1 ·
Everytime I add calcium, the PH goes up a little.. Is it possible to have it not go up...
I have added gypsum (calcium sulfate).

I just added limestone (calcium carbonate, i think).. I know this will raise PH too.

I'm actually surpised on how much plants need calcium.
 
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