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DC634 02-26-2020 10:31 AM

Calculating Ca
 
Is there a way to calculate the levels of Calcium and Magnesium given results for KH and GH?

KH: 4 dKH
GH: 12 dGH

If not, what is the best way to get these numbers?

BBradbury 02-26-2020 10:43 AM

Hello DC...

If you want the specific numbers for the mineral content of your water, you can check with a few places. Your local water department will have it. Some pet stores have the means to give you those numbers, as will your local high school chemistry departments. Take your pick.

B

ZxC 02-26-2020 10:48 AM

Yes there is:


Quote:

API Ca test kit can detect 0, 5, 10, 15, 20, … ppm Ca.

Get 20 ml of aquarium water, add 5 drops of #1 solution and mix.
Start adding 1 drop of #2 solution and mix and watch for colour change from pink to blue. Each drop of #2 solution equals to 5 ppm Ca.

How do I test for Mg?
First test for GH and Ca, then calculate Mg.
Mg testing
((17.86 x dGH) - (2.5 x Ca ppm)) / 4.1 = Mg ppm
(ppm dGH - (2.5 x Ca ppm)) /4.1 = Mg ppm

DC634 02-26-2020 10:50 AM

I am not looking at water straight from the tap so the city treatment plant would not be the ideal place to go. I was more wondering if there is some kind of formula I could use on a regular basis to calculate them when I test my KH and GH parameters.

DC634 02-26-2020 10:53 AM

So in other words I need to purchase a Ca testing kit. Then from there I could calculate Mg.

Thanks

ZxC 02-26-2020 11:09 AM

Quote:

Originally Posted by DC634 (Post 3537043)
So in other words I need to purchase a Ca testing kit. Then from there I could calculate Mg.

Thanks

Yes that is how it's done.

Total gH - Calcium's contribution to gH = Magnesium gH.

DC634 02-26-2020 11:44 AM

Alright, thanks. I will order one when I get home.


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