KH, pH, and co2 relationship - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 09-21-2004, 07:14 PM Thread Starter
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KH, pH, and co2 relationship

In the relationship between KH, pH, and co2:

which is the most dependent variable? I assume it is pH, correct? The 2 variables that I can control are co2 and KH. co2 is a constant depending on, obviously, the amount of co2 I am pumping into the tank. And I can increase and decrease KH by adding to the buffering capacity (with crushed coral, or other agents). Therefore if I consider my pH to be too low, is the best idea to increase my KH, and then through water changes get my pH back up to near 7.0?

Please let me know what flaws are in this analysis, if any. My pH is sitting at 6.4 right now, and I need to start increasing it. and then to keep it consistent.

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post #2 of 6 (permalink) Old 09-21-2004, 07:30 PM
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You got it right. pH is dependent on KH and CO2. KH and CO2 are independent. KH is affected by buffers you add and CO2, well simply by the CO2 you add. Quite simple.

So since pH is dependent and just along for the ride, to raise it add more KH. I don't think water changes will be necessary. Just dose drop some crushed coral in your filter.

BTW, what is your KH?
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post #3 of 6 (permalink) Old 09-21-2004, 08:17 PM Thread Starter
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KH is just 3 right now!

This is from having only used RO in that tank. I am going to start doing 1/2 tap and 1/2 RO from here on.

I did just add about 1.5TB/25g of CC. That should at least hold it consistent until I can get the tank in check.

at 7.0pH, what is the optimal KH whilehaving the proper co2?

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post #4 of 6 (permalink) Old 09-21-2004, 08:30 PM
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Download chucks calc so you get a CO2 chart. Type chucks planted aquarium in google and it should be the first link. At a pH of 7, a KH range of 6-9 will give you good levels of CO2.

What's wrong with your tap water?
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post #5 of 6 (permalink) Old 09-21-2004, 08:34 PM Thread Starter
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tap water is 8.1 pH, and hard as hell. I have an RO unit at my house for my other fish, so may as well take advantage of it here. I use RO Right to add all the necessary nutrients/minerals/etc back into it. I keep my GH at 6.

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post #6 of 6 (permalink) Old 09-21-2004, 08:51 PM Thread Starter
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While on the topic. Any idea of how much CC it would take to make the PH at 6?

And also, how often would I need to change it out? Or how long does it take for it to lose its effect (i am refering to CC).

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