Magnesium in my water - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 10-27-2005, 03:28 PM Thread Starter
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Magnesium in my water

I just got the detailed water report for my city water supply.

It says:

Total hardness as CaCO3 : 403 ppm

Calcium as CaCO3 : 236 ppm

Magnesium as CaCO3 : 167 ppm



I read that you really only need 5 to 10 ppm of Magnesium. So what is this about? I don't understand what it means when it says magnesium as CaCO3.

I am guessing though that I don't need to dose magnesium.

Regards,
Barry
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post #2 of 6 (permalink) Old 10-27-2005, 04:26 PM
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you have some fairly hard water.
and no, you won't need to ever dose magnesium. regular water changes will ensure your magnesium and calcium levels are more than adequate.
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post #3 of 6 (permalink) Old 10-27-2005, 07:07 PM
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Quote:
Originally Posted by banderbe
Calcium as CaCO3 : 236 ppm

Magnesium as CaCO3 : 167 ppm
that gives you
Ca = 236/2.5=94ppm
Mg = 167/4.1 = 41ppm

You have plenty of both.


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post #4 of 6 (permalink) Old 01-21-2006, 12:12 AM Thread Starter
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Quote:
Originally Posted by malkore
you have some fairly hard water.
and no, you won't need to ever dose magnesium. regular water changes will ensure your magnesium and calcium levels are more than adequate.
I found out that my home has a water softener that strips out the calcium and replaces with sodium.

Now my GH is around 70 ppm so I guess if I know what my hardness is before softening (from the report) and after (from my aqua. pharm test kit) then I can calculate how much calcium still remains?

Or is it possible that all the calcium is stripped out and something else is accounting for that 70 ppm GH.

BTW, my KH is 360ppm (20 dH)

Regards,
Barry
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post #5 of 6 (permalink) Old 01-21-2006, 07:41 PM
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Quote:
Originally Posted by banderbe
I just got the detailed water report for my city water supply.

It says:

Total hardness as CaCO3 : 403 ppm

Calcium as CaCO3 : 236 ppm

Magnesium as CaCO3 : 167 ppm



I read that you really only need 5 to 10 ppm of Magnesium. So what is this about? I don't understand what it means when it says magnesium as CaCO3.

I am guessing though that I don't need to dose magnesium.
"Magnensium as CaCO3" I think means it would take 167 ppm of CaCO3 to add the same amount of CO3 as you have in the form of MgCO3. It seems that hardness figures are always given in that form. But, in any case you do have enough magnesium.

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post #6 of 6 (permalink) Old 08-07-2009, 07:26 PM
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How much magnesium in my water?

A while back I called the water company in my town to ask for water parameters. I was told that total hardness was 98 ppm and calcium hardness was 67 ppm. I did find an explanation on the web on how to calculate the amount of magnesium but I'm not sure if its correct or if I did it correctly.

98 ppm - 67 ppm = 31 ppm magnesium hardness.

31 ppm / 4.1 = 7.56 ppm magnesium

I don't understand the difference between magnesium hardness vs. magnesium in the water. I'm not sure why they described dividing by 4.1 either.

My objective is to determine if my water provides sufficient magnesium in ratio to the calcium that is in the water. I'm also thinking that my water is soft at 5.488 GDH.

Any advise from folks with chemistry skills would be appreciated.

Regards,

Henry
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