CO2 diffusion question
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Old 03-07-2013, 06:33 PM   #1
syzygy9
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CO2 diffusion question


I have the Sera Flora 1000 CO2 reactor on my 38G bowfront. It seems to take forever to diffuse the CO2 into the water though it does seem like it does a good job as I cannot see any bubbles coming through the spraybar.

I base my "takes forever" assesment on the fact that the reactor continues to gurgle (the sound it makes as the spinning blade chops up the CO2 pocket) for about 90minutes after the CO2 flow is shut off.

The common consensus seems to be that one should turn the CO2 on 1 hour before lights on and off 1 hour before lights out. Is it safe to say in my situation that I should be upping those numbers to more like 2hrs? It just seems pointless for it to continue to diffuse CO2 for 30 minutes after the lights are out.

Last edited by syzygy9; 03-07-2013 at 11:33 PM.. Reason: unclear 2nd paragraph
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Old 03-07-2013, 09:52 PM   #2
xmas_one
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The indicator is what is taking forever. Try a pH pen and you'll see that your reactor is working fine.
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Old 03-07-2013, 11:36 PM   #3
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My Cerges style reactor and Rex Griggs style reactor both took a considerable amount of time to diffuse the left over co2. I think part of it is the water colum is saturated with co2 already by the time it turns off that the co2 doesn't disolve as fast when first turned on.
I turn my co2 off 2 hours before the lights go off and I still find a little co2 left in there. I test my ph right when lights go off and it is the same in the middle of the day and in the morning.

Might as well get the most use out of the co2 you have, no sense wasting it if you don't need to.
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Old 03-07-2013, 11:37 PM   #4
syzygy9
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Quote:
Originally Posted by xmas_one View Post
The indicator is what is taking forever. Try a pH pen and you'll see that your reactor is working fine.
I think I may have caused confusion by mentioning my indicator so I edited the original post. I know there is about a 2hr lag in the indicator. My point was that my reactor continues to churn and diffuse the built up CO2 in the reactor for 90 minutes AFTER the CO2 is turned off.

Does anybody else's reactor do this? As best as I can tell the Sera Flora is just a Cerges variant.
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Old 03-07-2013, 11:42 PM   #5
syzygy9
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Quote:
Originally Posted by latchdan View Post
My Cerges style reactor and Rex Griggs style reactor both took a considerable amount of time to diffuse the left over co2. I think part of it is the water colum is saturated with co2 already by the time it turns off that the co2 doesn't disolve as fast when first turned on.
I turn my co2 off 2 hours before the lights go off and I still find a little co2 left in there. I test my ph right when lights go off and it is the same in the middle of the day and in the morning.

Might as well get the most use out of the co2 you have, no sense wasting it if you don't need to.

Interesting...I hadn't considered water column saturation. If that is the culprit then turning it off 2hrs early makes sense, but turning the CO2 on 2 hrs early does not.

Looks like I need to get one of those PH pens that xmas_one mentioned.
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