Determining CO2 levels with chart - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 08-22-2012, 04:46 PM Thread Starter
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Determining CO2 levels with chart

So I found this chart in the fertilizer sticky and it seems to indicate that you can check your co2 levels by ph and kh. Is this a decent method? Also, what is a good target for co2, 30-40ppm?

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post #2 of 8 (permalink) Old 08-22-2012, 04:51 PM
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it is NOT a good method

assume u are at 0 ppm c02 to start. the resulting change in ph from there is a good guesstimator but the ph change is heavily related to how much KH or carbonate alkaliity you have. the higher the KH. the less ph change u will have with c02

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post #3 of 8 (permalink) Old 08-22-2012, 05:21 PM
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The KH/pH chart works in an ideal situation, but in a tank there is other chemistry going on that changes how it behaves somewhat. The degas thing is not reliable. The chemistry described by the chart is the basis for how drop checkers work, but they keep the water in the checker separate from the tank - all that is present is water, CO2, and an indicator.
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post #4 of 8 (permalink) Old 08-22-2012, 05:59 PM Thread Starter
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So besides a drop checker... how would you measure co2 levels?
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post #5 of 8 (permalink) Old 08-22-2012, 06:21 PM
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http://www.oxyguard.dk/products/co2-...s/co2-analyzer

One of these get your wallet out

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post #6 of 8 (permalink) Old 08-22-2012, 07:17 PM Thread Starter
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Lol... I wish

I just want to know how well my co2 reactor is doing. Is a drop checker the best way?
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post #7 of 8 (permalink) Old 08-22-2012, 11:29 PM
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There is no accurate way for a hobbyist, with a normal size wallet, to measure CO2 in water. A drop checker is just a good way to encourage you to add enough to begin to be effective, but when it indicates 30 ppm, you only know that you have somewhere between about 15 and 45 ppm. You have to very slowly increase the bubble rate, watch for changes to the plants, and for distress by the fish, in order to get the CO2 level up to the optimum value. This process should take a week or more.

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post #8 of 8 (permalink) Old 08-23-2012, 01:11 AM Thread Starter
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Thanks hoppy!
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