calculating CO2 concentration - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 04-02-2003, 12:12 AM Thread Starter
 
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okok, i know there are charts and all, and i have found an equation, but it has to be flawed. i am wanting to put it into a spread sheet, so i can have a daily record of my CO2 levels, and what not.

anyway...

Thanks

~Doug
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post #2 of 9 (permalink) Old 04-02-2003, 02:41 AM
 
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Its flawed to the extent of the accuracy of your ph and kh testing. It can also be rendered useless if there are buffers or acids in the tank other than carbonates.

Marcel
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post #3 of 9 (permalink) Old 04-02-2003, 04:26 AM Thread Starter
 
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i'm sorry, i should say that there was an error in it and i was after a corrected equation
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post #4 of 9 (permalink) Old 04-02-2003, 04:31 AM Thread Starter
 
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his equation had 7-pH at the end--> my pH is right around 7 to 7.2 and that results in multiplying by 0 and that isn't cool, and it also give me "high" negative numbers if my pH is 7.2

CO2 (in PPM) = 3 * KH * 10( 7-pH ), is what i found

Thanks

~Doug
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post #5 of 9 (permalink) Old 04-02-2003, 07:25 PM
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The correct formula is 3.6*KH*10 ^ (7-pH)

I use 3.6, but have seen equations with 3, I'm not sure which one is accurate. By taking 10 to the power of (7-pH), it is impossible to get negative numbers or multiply by 0. Hope this helps!

-Tim
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post #6 of 9 (permalink) Old 04-02-2003, 07:40 PM
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Heck if you don't want to calculate bookmark this page!

http://www.csd.net/~cgadd/aqua/art_plant_co2chart.htm

Felix

20G heavily planted tank with Eco Complete
Pressurized CO2, Eheim Ecco 2236, 1 55W and 1 36W bulb
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post #7 of 9 (permalink) Old 04-02-2003, 10:04 PM Thread Starter
 
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you see kor4ever, i was attempting to avoid having to go to a website every time i wanted to calulate this, this way all i have to do is type in my Kh and pH values, and then i have the calulation done for me.

And A BIG thanks to Tim

~Doug
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post #8 of 9 (permalink) Old 04-02-2003, 11:52 PM
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I have been trying to do the same thing! I must be to thickheaded to understand tho. I hope you get a good answer so I can use it too!

Eheim pimp #128, 55gal 13x20x48, Eheim Pro 2227, CO2 injected, into the filter breather tube,4x 55w Pcs , 12 hr light cycle (sunrise/sunset simulated), Milwaukee SMS 122, faulty bubble counter replaced with M3 bubble counter..... moderately Planted, Plantex CSM+B and ferts

To steal ideas from one person is plagiarism; to steal from many is research
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post #9 of 9 (permalink) Old 04-03-2003, 12:29 AM Thread Starter
 
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it worked
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