kH and RO Relationship - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 02-23-2008, 04:16 AM Thread Starter
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kH and RO Relationship

I have a question regarding the Kh of RO water relationship.

I just recently bought an RO unit and I am trying to figure out my CO2 content. When you compare the PH of 7 and a kH of 0 on a CO2 Chart it should be 1.5, which is it, but this means it's very unstable right? If I want to add enough CO2 to get to my target range it would have to drop the PH all the way down to 6.3. I'm raising discus, but not Heckles so I want my ph at about 6.8. From what I understand ideal water has a Gh and kH between 3 and 6.

From what I can understand of this tangled web is that if I want a PH of 6.8 I need a kH of 4 which would give me a CO2 of 15ppm, but I would have to add NaCHO3. Is this the best way? Why is it that RO Right and other reconstructing agents only add Gh and don't rebuffed the water with kH.
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post #2 of 3 (permalink) Old 02-23-2008, 06:11 AM
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Originally Posted by emhigginson View Post
Why is it that RO Right and other reconstructing agents only add Gh and don't rebuffed the water with kH.
It's because you can control the GH and KH separately. Some people have a big difference between the GH and KH and adding an "all in one" product wouldn't work for them.

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post #3 of 3 (permalink) Old 02-25-2008, 04:01 PM
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Originally Posted by emhigginson View Post
I need a kH of 4 which would give me a CO2 of 15ppm, but I would have to add NaCHO3.
Well without getting more info from you it appears your using your pH and Kh values to 'give' you co2. Your co2 levels are only as much as you are putting in regardless of what pH/KH levels are. For example some have tanks with no co2 injection but thier pH and KH values are such that you would get something like 20 ppm or something like that which isnt possible. Just want to make sure you realize how these interrelate and that the pH/KH calc doesnt always work to estimate your CO2 for tank water that could have other pH effecting things skewing the results.
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