Calcium conundrum - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 03-06-2006, 06:05 PM Thread Starter
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Calcium conundrum

Living in New York, I have extremely soft water, and need to supplement Calcium and Magnesium regularly. I am aiming for the recommended levels of roughly 7-8ppm Mg, and rougly 30ppm Ca.

What I need to know is whether the recommended 30ppm Ca is referring to straight Ca, or as calcium hardness as CaCO3? The Lamotte test measures it as CaCO3, and my tank reads 56ppm.

Does that mean that I have 56ppm Ca which is higher than recommended, or do I have 22ppm Ca which is lower than recommended?

Also, if I have 56ppm Ca as CaCO3, and 116ppm Gh as CaCO3, how much Magnesium does that give me? I am assuming that I have 60ppm Mg as CaCO3 which converts to 15ppm Mg. Is this correct?

Thanks for any info.
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post #2 of 5 (permalink) Old 03-06-2006, 08:26 PM
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116ppm gh is not really soft water. With that water you do not need to add buffers. A lot of plant grow better in softer water.


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post #3 of 5 (permalink) Old 03-06-2006, 08:37 PM Thread Starter
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116 is the hardness after dosing Ca and Mg. The hardness is 25ppm from the tap.
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post #4 of 5 (permalink) Old 03-12-2006, 06:12 PM
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If you had RO water, to raise 50 gallons of water by 4dGH with a 4:1 ca:mg ratio, one would add 15.9 grams of Cacl2 and 6.7 grams of mg. Be sure not to add them at the same time, or you end up with really hard to dissolve calcium sulfate.





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post #5 of 5 (permalink) Old 03-18-2006, 12:42 AM
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Magnesium

(GH (Ca + Mg) en ppm) - (2.5 x KH (Ca) en ppm) divide by 4.1

= Magnesium concentration

EX. GH = 4?dGH or 71.44 ppm (17.86 x 4)
and KH is 20 ppm

(GH) 71.44 ppm - (2.5 x (KH) 20 ppm) = 50 divide by 4.1 = 5.22
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