How much calcium in softened water? - The Planted Tank Forum
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post #1 of 1 (permalink) Old 01-25-2006, 07:10 PM Thread Starter
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How much calcium in softened water?

Another thread got me thinking about my water..

My city water report says:

Total hardness: 403 mg/L
Calcium as CaCO3: 236 mg/L
Magnesium as CaCO3: 167 mg/L

So that tells me Calcium makes up approximately 58.56% of my total hardness.

My water passes through a water softener after which my GH test kits indicate about 70 ppm.

So, would I be correct in estimating that of that 70 ppm, 70*0.5856 = 40.99 ppm is made up of Calcium?

Or, is my water softener getting all of the calcium and the remaining hardness is magnesium?

What I don't understand is why my remaining hardness isn't 167 ppm (the amount of magnesium). Clearly the water softener is stripping out magnesium as well. If this is true, then perhaps the ratios hold for both before and after the water softener processes the water. Then again I test GH with 5 in 1 Jungle Lab strips so maybe my GH is in fact 167ppm

Who knows, maybe there's no way to tell.. I just want to be sure I have enough Mg and Ca for my plants and that I do not need to supplement.

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