GH and KH - The Planted Tank Forum
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post #1 of 25 (permalink) Old 03-17-2008, 12:21 AM Thread Starter
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GH and KH

Excuse my Ignorence ,I'm new with all this stuff so I need some help.

on my GH I had to add 8 drops to get to the end color, what whould my ppm be.

What is ppm and KH exactly?
Please put in simplest form.
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post #2 of 25 (permalink) Old 03-17-2008, 12:32 AM
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Which brand test are you using?

ppm = parts per million

kH = carbonate hardness





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post #3 of 25 (permalink) Old 03-17-2008, 12:37 AM Thread Starter
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Red Sea
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post #4 of 25 (permalink) Old 03-17-2008, 12:38 AM Thread Starter
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What rises and lowers KH?
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post #5 of 25 (permalink) Old 03-17-2008, 01:46 AM
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For aquarium use, baking soda and crushed coral are used most commonly.

I'm not familiar with Red Sea's test kit- if the info isn't in the package or on the bottle, I'd check their website?





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post #6 of 25 (permalink) Old 03-17-2008, 01:51 AM Thread Starter
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so wou baking soda and crushed coral higher or lower the hardness.
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post #7 of 25 (permalink) Old 03-17-2008, 01:53 AM
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They would raise the hardness.

To lower the hardness you would need to mix in Reverse Osmosis or Distilled water.





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post #8 of 25 (permalink) Old 03-17-2008, 01:55 AM Thread Starter
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What's reverse osmosis
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post #9 of 25 (permalink) Old 03-17-2008, 02:01 AM
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Reverse Osmosis refers to a special filtration process that strips the water of just about everything, leaving just pure H2O. I have an RO unit under my sink that purifies my well water for drinking, and that I will probably end up using for my discus tank to lower the hardness of my water.

Now the big picture question- why are you thinking about wanting to change your water parameters?





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post #10 of 25 (permalink) Old 03-17-2008, 02:25 AM Thread Starter
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for GH here in the test kit it says 4-8 is soft
would you know what the ppm for that would be
it doesn't say anything how to convert that to ppm
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post #11 of 25 (permalink) Old 03-17-2008, 02:28 AM
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I know that there's a forumula for converting degrees of hardness to ppm somewhere on this forum, it was in a recent thread- I believe it was Left C who posted it- maybe you could PM him?

Is there some reason that you don't want soft water?





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post #12 of 25 (permalink) Old 03-17-2008, 02:30 AM Thread Starter
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say here "number of drops= degrees GH or KH as appropriate"
so my Hardness would be 8 degrees
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post #13 of 25 (permalink) Old 03-17-2008, 03:05 AM
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One German degree of hardness is equivalent to about 17.8575 ppm. This is true for both GH and KH. Both are usually expressed as if calcium carbonate (CaCO3) is the sole source of hardness.

If you want to go from ppm to degrees, you can multiply ppm by 0.056 to get degrees. You can also divide ppm by 17.8575 to get degrees and you can divide degrees by 0.056 to get ppm.

Most people use 17.86 or 17.9 to do the conversion instead of 17.8575.

http://www.thekrib.com/Plants/CO2/ha...arryfrank.html
http://www.thekrib.com/Plants/CO2/khgh.html

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post #14 of 25 (permalink) Old 03-18-2008, 03:02 AM Thread Starter
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so my ppm is 142.85
what sould my ppm be ?
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post #15 of 25 (permalink) Old 03-18-2008, 03:05 AM
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The huge majority of plants can grow just fine in either soft or hard water. Your water is probably pretty good. What are you trying to grow/raise?

Mike


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