pH, kH and CO2 - stupid question - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 03-28-2007, 05:38 PM Thread Starter
 
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pH, kH and CO2 - stupid question

I'm in the process of setting up my CO2 controller and trying to determine 'optimal' pH value for my aquarium. Now my water has pretty high kH (about 5 or 6 right from the tap), so looking at the chart (https://www.plantedtank.net/forums/at...-co2-chart.gif)
it seems that my pH should be in around 7 range. But than I should hardly need to add any CO2 to stay that way. Does it mean that my water is already saturated with CO2? Unlikely I think, so I guess I'm missing something fundamental in my understanding of how it works.
Would appreciate your thoughts.
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post #2 of 4 (permalink) Old 03-29-2007, 01:45 AM
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If you are not injecting CO2 you don't have any. You need to test tap water pH after it has sat for at least 24 hours. A KH of 5 or 6 means you should have a pH around 7.6-7.8
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post #3 of 4 (permalink) Old 03-30-2007, 01:35 AM Thread Starter
 
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Ok, so I let tap water to stay 24 hr and measured pH with Pinpoint monitor - it showed 7.5. Looking at the chart, I guess I'd have to inject CO2 to keep pH somewhere around 6.6-6.8 - does this sounds reasonable?
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post #4 of 4 (permalink) Old 03-30-2007, 02:12 AM
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Yes. But I would go for more like 6.5 to get 30 ppm.
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