Water Hardness - dumb, but quick, question - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 08-16-2014, 06:33 PM Thread Starter
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Water Hardness - dumb, but quick, question

Please tell me if I'm right about this:

So, this is from my cities' water report.

Hardness (ppm) 46
Hardness (grains/gallon) 2.7

This is from wikipedia.

1 dGH = 1.042645169
&
1 dGH corresponds to 17.848ppm

So, It looks like the grains/gallon is roughly equivalent to Degrees of General Hardness.

My question is Degrees of General Hardness the general term that we use around here when speaking of water hardness?


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post #2 of 7 (permalink) Old 08-16-2014, 08:05 PM
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It does help to specify which measure one is using. Sometimes a user will say his hardness is 10 or whatever and I'm not sure which whether he means dGH or ppm.
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post #3 of 7 (permalink) Old 08-16-2014, 08:14 PM
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Trusting a city's water report is the first thing I would alter. Just because it is at one level where they tested it does not mean that all the pipes and passages between there and your tap don't alter levels.
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post #4 of 7 (permalink) Old 08-16-2014, 11:52 PM Thread Starter
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Quote:
Originally Posted by gmh View Post
It does help to specify which measure one is using. Sometimes a user will say his hardness is 10 or whatever and I'm not sure which whether he means dGH or ppm.
Yeah, I think there's also KH, which I've heard people talk about, but I don't' really know how these (or if) work together.



Quote:
Originally Posted by ShyShrimpDoc View Post
Trusting a city's water report is the first thing I would alter. Just because it is at one level where they tested it does not mean that all the pipes and passages between there and your tap don't alter levels.

well, If I read the report right, these are averages from user's water sources. Anything dangerous (or potentially) was listed as highest detected. I live on a big aquifer.

but you're absolutely right. There could even been pretty big differences between the street and my tap. It's probably a good enough estimation for me though.


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post #5 of 7 (permalink) Old 08-17-2014, 12:08 AM
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Yeah, it's likely you have soft water. lucky you.
kh is measured in the same way as gh, by the way.
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post #6 of 7 (permalink) Old 08-17-2014, 12:58 AM
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Both GH and KH are commonly reported in either of 2 formats when you are talking about aquariums, and most people can relate to both.

German degrees of hardness, abbreviated dGH and dKH.
Parts per million, abbreviated ppm, and you need to specify GH or KH.

There are 17.9 ppm in one German degree of hardness.

For a really quick translation, I usually think of that as 20.
So if the GH is reported as 100 ppm, I would instantly say, Oh, not too far off 5 dGH. Fairly soft water. But if I use the calculator it is closer to 5.6, which is still fairly soft.

Test strips usually show ppm.
Test tube and reagent tests usually result in German degrees of hardness.
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post #7 of 7 (permalink) Old 08-17-2014, 08:08 PM Thread Starter
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Thank you that is very helpful. I'm more of a technical guy and am pretty ignorant when it comes to some of this stuff. You all have helped me wrap my mind around this a little better and clear up some questions I still had.


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