How to calcuate Mg if you know Ca and GH? - The Planted Tank Forum
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post #1 of 3 (permalink) Old 03-23-2019, 01:56 AM Thread Starter
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How to calcuate Mg if you know Ca and GH?

Thought someone told me how to do this about a month ago but I can't find the thread.


Does anyone have a link or know how to calculate you magnesium if you know your calcium and gh?



How are people usually calculating or measuring their magnesium?
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post #2 of 3 (permalink) Old 03-23-2019, 02:13 AM
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Mg ppm = ((17.86 x dGH) - (2.5 x Ca ppm)) / 4.1

that formula should get you within the ball park.

JBL makes a freshwater magnesium test kit but you might have to order it off e bay or amazon.

There's always your city's water report too unless they omit listing magnesium for w/e reason (my case lol)
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post #3 of 3 (permalink) Old 03-23-2019, 02:38 AM Thread Starter
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Quote:
Originally Posted by SingAlongWithTsing View Post
Mg ppm = ((17.86 x dGH) - (2.5 x Ca ppm)) / 4.1

that formula should get you within the ball park.

JBL makes a freshwater magnesium test kit but you might have to order it off e bay or amazon.

There's always your city's water report too unless they omit listing magnesium for w/e reason (my case lol)

Thanks!
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