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Discussion Starter · #1 ·
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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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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Discussion Starter · #3 ·
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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