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post #1 of 8 (permalink) Old 09-05-2015, 02:54 PM Thread Starter
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Co2 off all night with bubbler going I see around 7.5?



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post #2 of 8 (permalink) Old 09-05-2015, 05:26 PM
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Close enough I suppose. Me personally I put the test tube in the middle of the colors on the color chart and which ever one it blends with the best is the winner


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post #3 of 8 (permalink) Old 09-05-2015, 06:13 PM
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That's the result. But what's the question?
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post #4 of 8 (permalink) Old 09-06-2015, 04:15 AM Thread Starter
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Was working on my co2

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post #5 of 8 (permalink) Old 09-06-2015, 04:29 AM
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If you want to know if you have adequate CO2 in the water, and are using pressurized CO2, you should measure the pH of the tank water just before the CO2 is turned on. Then measure the pH when it is at the lowest level, probably just before the lights are turned off. If the pH is 1.0 lower than it was before the CO2 was turned on, you have about 30 ppm of CO2. If it is 0.8 lower than it was before the CO2 was turned on, you have about 20 ppm. If it is 1.2 lower, you have about 50 ppm. That isn't very accurate, but it is more accurate than using the pH/KH/CO2ppm tables.

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post #6 of 8 (permalink) Old 09-06-2015, 04:21 PM
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Yes, the test results are right in that middle range where the 2 tests overlap.
Now, follow Hoppy's instructions, and get a 'high' and a 'low' pH test.
Try the pH test at different times through the day to find the 'low'.
When the CO2 comes on (before lights come on) the CO2 will rise, and pH will drop. Probably be at its lowest right before lights come on.
When the lights come on the plants will start using the CO2.
Throughout the day the plants will be using the CO2, so it will be difficult to know when it is really at the highest level of CO2, and therefore lowest pH.
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post #7 of 8 (permalink) Old 09-11-2015, 05:29 PM
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Quote:
Originally Posted by Hoppy View Post
If you want to know if you have adequate CO2 in the water, and are using pressurized CO2, you should measure the pH of the tank water just before the CO2 is turned on. Then measure the pH when it is at the lowest level, probably just before the lights are turned off. If the pH is 1.0 lower than it was before the CO2 was turned on, you have about 30 ppm of CO2. If it is 0.8 lower than it was before the CO2 was turned on, you have about 20 ppm. If it is 1.2 lower, you have about 50 ppm. That isn't very accurate, but it is more accurate than using the pH/KH/CO2ppm tables.
Hoppy, I understand the theory of this method, but I do have a question about what the true high value is. I have a pH probe on my apex holding my pH at 6.3 when the lights are on. (At my KH of 2.5, this would be about 40ppm CO2 according to those charts you love). My "starting" pH in the morning is usually somewhere between 7.2 and 7.4 - not consistent. Also, my pH climbs gradually after my CO2 shuts off. (13 hours until it turns back on again). If I increased my photoperiod and reduced my CO2 off time, my pH wouldn't have a chance to climb so high. This would change my starting point, correct?
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post #8 of 8 (permalink) Old 09-12-2015, 03:22 AM
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Correct.

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