help make sense of water report - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 01-02-2007, 10:07 PM Thread Starter
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help make sense of water report

According to my local area water report
http://ch.ci.garden-grove.ca.us/inte...f/wqr-2006.pdf

it says the water has

Total Alkalinity (ppm as CaCO3) 184
Total Hardness (ppm as CaCO3) 316

Is this a measurement of GH and KH? Also I noticed people talk about single digit GH/KH values. Is there a conversion I need to do?

thanks
john


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post #2 of 3 (permalink) Old 01-03-2007, 06:41 AM
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Originally Posted by istareatplants View Post
Total Alkalinity (ppm as CaCO3) 184
Total Hardness (ppm as CaCO3) 316

Is this a measurement of GH and KH? Also I noticed people talk about single digit GH/KH values. Is there a conversion I need to do?
The total hardness is basically GH. For practical purposes, total alkalinity ~= KH. There is no need to do a conversion to dGH/dKH, but if you want to you can divide by 17.8. This is like changing "kph" to "mph" on your speedo. Different numbers but chemistry remains the same.
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post #3 of 3 (permalink) Old 01-03-2007, 06:21 PM Thread Starter
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thanks for the reply tsigoloeg.

so 316/71.8 gives me 17GH! thats pretty hard!

I guess i will have to mix in some RO water with the tap =/


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