City water hard or no? - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 04-14-2009, 02:16 AM Thread Starter
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City water hard or no?

I was looking at my city's water parameters, and was wondering if I could get a translation for what i found.

Measurements were taken 4 times through the course of this past year, all ranged from "286-334 mg/L as CaC03". I've been told that the city has soft water, however from my understanding this is hard water. I've no idea what effect the "as CaC03" has. IIRC, it involves carbonate, which would make these measurements KH right?
I dunno!
So, what does this mean as far as hardness is concerned?

Also found out the avg PH is 8...
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post #2 of 3 (permalink) Old 04-14-2009, 02:19 AM
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The "as CaCO3" is just a method of measurement, it needs to be compared to something, basically. Both GH and KH can be expressed in those terms, so if that's all they list it'd likely be a "total hardness" measurement. Yes, that's hard water.

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post #3 of 3 (permalink) Old 04-14-2009, 04:30 AM
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I'm not sure why this is done, because I'm no chemist, but I think they convert the ppm of all other hardness causing compounds to equivalent calcium carbonate concentrations. It may be because calcium carbonate is the most common hardness compound in natural waters.

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