can i calculate magnesium if i know KH, GH and TDS ? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 03-24-2015, 04:04 PM Thread Starter
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can i calculate magnesium if i know KH, GH and TDS ?

Hi,
is it possible to calculate calcium and magnesium amount in water if i know my water is
KH=7
GH=7
TDS=200ppm
?
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post #2 of 4 (permalink) Old 03-24-2015, 04:52 PM
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I looked into this a few months ago and it looks like unless you know either calcium or magnesium, there is no way to calculate the value of either one.

Someone with more water chemistry expertise may chime in, but I was unable to find any way of doing this with just gh/kh/TDS.

Ben
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post #3 of 4 (permalink) Old 03-24-2015, 04:57 PM
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No you cant do that. GH is made up of both calcium and magnesium but without specific test kits for each you do not know the amount of each making up your 7dgh.
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post #4 of 4 (permalink) Old 03-25-2015, 04:01 PM Thread Starter
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ok thanks for the replays
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