caco3 and ca - The Planted Tank Forum
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post #1 of 2 (permalink) Old 05-22-2011, 12:55 AM Thread Starter
Algae Grower
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caco3 and ca

my water averages 70 ppm caco3 and 25.5 ppm ca.
this seems to not mesh with the numbers you guys are posting. Can anyone explain this too me? and what are safe ranges for plants!?

Last edited by rpddink; 05-22-2011 at 03:39 AM.
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post #2 of 2 (permalink) Old 05-22-2011, 04:32 AM
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How do you determine how much CaCO3 is in the water? Is there a test kit for that? If you have 70 ppm of CaCO3, you have 28 ppm of Ca. Given the uncertainty in the ppm of CaCO3, I would say your 25.5 is right on the button.

Most places where you see the ppm of calcium in water, they express it as if it were in the form of Calcium oxide (CaO). That will be a different number.

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