KH/PH chart question - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 05-11-2012, 08:40 PM Thread Starter
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KH/PH chart question

When using this chart should i use the PH of my water while the CO2 is on? or should i use the PH from water that has been removed for the tank for 24hrs to allow the CO2 to escape?
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post #2 of 9 (permalink) Old 05-11-2012, 10:12 PM
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I would think you'd use the pH without CO2. That's your true pH anyway. Adding CO2 will lower the measured pH value, but it's essentially a false measurement and is in no way indicative of the actual pH of the water.
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post #3 of 9 (permalink) Old 05-11-2012, 11:00 PM
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If you're using it to calculate your CO2 then you would measure pH when the CO2 is on.
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post #4 of 9 (permalink) Old 05-12-2012, 12:35 AM
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The actual pH is whatever you measure with a calibrated pH probe. When CO2 is added, the actual pH drops, and that is the pH you use with the table to determine how much CO2 is in the water - or it would be if your water was "perfect", distilled water with nothing in it to affect pH other than carbonates, bicarbonates and CO2. Our aquarium water almost never meets that requirement.

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post #5 of 9 (permalink) Old 05-13-2012, 02:23 PM Thread Starter
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Ok, so I'll go with the PH when the co2 is running. Thanks all.
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post #6 of 9 (permalink) Old 05-13-2012, 09:54 PM
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Is the KH/pH chart a recommendation for CO2 insertions, or an accurate way to calculate CO2 without having any diffuser/insertions?


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post #7 of 9 (permalink) Old 05-16-2012, 11:03 PM Thread Starter
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its really only a guideline/estimate as to how much CO2 is in your water. Its not 100% accurate, just something to go by.
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post #8 of 9 (permalink) Old 05-17-2012, 01:10 AM
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Its between 15% and 90% accurate depending on whats in ur water... waaayyy too many variables. If ur ph from the tap is 6 and kh of 22. U dont have 300ppm c02. U likely only have 2-3ppm unless more is injected.
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post #9 of 9 (permalink) Old 05-17-2012, 02:49 AM
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Not accurate. Too many other things in the water affecting the pH.
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