Sudden Drop In Co2 Use After Trimming?

edwardsmith

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Apr 24, 2015
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I use an Apex to measure my pH and control my CO2, hence it shows me how often the CO2 is on. I did a large trimming and replanting and, for the moment, there is a much smaller plant bioload. At the same time, I re-calibrated the pH probe.

After those actions, my CO2 injection decreased significantly. I'm assuming that's from the decreased plant load? Is that a common experience? Just paranoid that I need a new pH probe. Thanks!
 

Swissal

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Nov 8, 2015
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I have had similar thoughts in the past, but in my opinion it is normally a calibration issue. I don`t know how the apex works, I have a GHL system, but I guess they work on a similar principle. On the GHL I can read the calibration data of the probes, so I always note these values before doing a calibration, and then again after. If the values are grossly different, then something either went wrong with the calibration, or the probe is on it`s way out. Once, the probe really was playing up, and the CO2 consumption changed dramatically. Since then I never re-calibrate and make other changes at the same time, otherwise if such an effect like what you`re seeing does occur, then you can`t identify what the cause was.
If you are able to read the calibration data on the Apex (it must be possible), then I would suggest you read this before you re-calibrate next time, and compare the values to those after the calibration. I guess it`s too late for that this time though, since the new calibratin data has already been saved to the Apex.
Also, if the calibration data does change dramatically, it doesn`t necessarily mean you need a new probe immediately. It just means you are operating in a different range, and that you maybe need to keep an eye on it.
 
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edwardsmith

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Apr 24, 2015
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Thanks, the probe is almost 2 years old and I have new one laying around, Im just going to switch it out. Thanks!