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Discussion Starter #1
A little while ago I set up a pressurized CO2 system, consisting of a 5 pound CO2 tank, a Milwaukee regulator with bubble counter and solenoid, a ceramic disk diffuser, and a drop checker for good measure. For the first little while (over a couple of days) the drop checker stayed blue. I kept increasing the bubbles per second trying to nudge the dissolved CO2 upwards. I guess I nudged to much and my drop checker turned bright yellow. I turned down the CO2 and waited a couple of hours but the drop checker stayed yellow. I turned the CO2 off waited a couple of hours again and the liquid remained yellow. I performed a number of water changes and added an airstore and the drop checker remained yellow. I pulled the drop checker out of the aquarium and placed it on my desk, where it sat and remained yellow for 2 weeks until it finally turned blue again. At no point during this time did the fish show any sighs of stress that might be associated with excess CO2. So I'm curious if anyone has ever "blown out" (for lack of a better term) their CO2 drop checker? Has your liquid refused to return to the blue colour?
 

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I followed the directions which just said use tank water. I know that wouldn't give me an accurate result but I don't see why it would be SOOO inaccurate for so long. When it sat on the desk it sat on its side to allow for air flow. I'm really just curious if this has happened to anyone else.
 

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If you don't use some kind of standard or known solution, you really can't tell with any accuracy how much CO2 is in the tank. It seems like you have some buffers in your water which would explain why there was a sudden increase from a higher pH with the blue coloration to a lower pH with the yellow coloration.
 

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you need a 4dkh solution to get an accurate co2 reading. where you using the solutions with the green cap that comes with the drop checker? if yes, don't use it. find your self a 4dkh solution
 

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Discussion Starter #7
If you don't use some kind of standard or known solution, you really can't tell with any accuracy how much CO2 is in the tank. It seems like you have some buffers in your water which would explain why there was a sudden increase from a higher pH with the blue coloration to a lower pH with the yellow coloration.

That would make sense about the sudden color change having to do with a buffer. But I'm just curious what would cause it to stay neon yellow like that for so long even after it was pulled out of the tank.
 

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Don't quote me on this but I think that the lag time for CO2 diffusion is around 2 hours; it won't degas immediately.

Your two two weeks though is a little crazy... Was the opening covered?
 

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it sounds to me like you got some co2 bubbles in your drop checker raising the co2 count in the air space far above what it should have been. Co2 will sink in regular air so you may have just had enough trapped that it took a couple of days to be thinned out enough, especially if you left the drop checker sitting base down on a desk so there was no way for air to move in an out of the drop checker.
 

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Makes sense

it sounds to me like you got some co2 bubbles in your drop checker raising the co2 count in the air space far above what it should have been. Co2 will sink in regular air so you may have just had enough trapped that it took a couple of days to be thinned out enough, especially if you left the drop checker sitting base down on a desk so there was no way for air to move in an out of the drop checker.
The drop checker was sitting on its side to allow for air flow, but it makes sense that the heavier then air CO2 would be in contact with the drop checker liquid even in this position based on its funny shape. I'm going to assume this is what happened. Curiosity cured. Thanks :D
 
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