How can I add calcium without raising PH?

4010 Views 6 Replies 4 Participants Last post by Edward, Mar 23, 2007

mistergreen

Discussion Starter · Mar 12, 2007

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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Aqua Dave

· #2 · Mar 12, 2007

My understanding is that calcium will only raise Gh and therefore shouldn't affect Ph. The carbonate in the calcium carbonate will affect Kh and Ph. Maybe something else is going on?

David

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Rex Grigg

· #3 · Mar 12, 2007

Calcium nitrate or calcium chloride will raise the calcium levels and leave the kH alone.

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mistergreen

Discussion Starter · #4 · Mar 12, 2007

I should test this stuff in a jar first. thanks.

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mistergreen

Discussion Starter · #5 · Mar 13, 2007

Limestone (CaCO3) lowers PH... fyi..
I guess it's the CO3 that did it..

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Edward

· #6 · Mar 23, 2007

mistergreen said:
Limestone (CaCO3) lowers PH... fyi..
I guess it's the CO3 that did it..

CaCO3 increases pH to 8 – 9

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Edward

· #7 · Mar 23, 2007

mistergreen said:
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).

Then it is not Calcium sulfate CaSO4. Calcium sulfate does not change pH.

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