How to measure CO2 levels in tank? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 06-11-2005, 06:48 AM Thread Starter
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How to measure CO2 levels in tank?

I finally got my pressurized CO2 tank setup and going. I know you want to aim for a certain bubble per minute ratio to give you a certain amount of CO2 in your water. How do you measure CO2 in your water so you know how many bubbles per minute to run?
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post #2 of 6 (permalink) Old 06-11-2005, 07:04 AM
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The easiest way to figure out your co2 level is to use a kH and pH test kit. You can then compare the two to determine the levels. Here's a link:

http://www.csd.net/~cgadd/aqua/art_plant_co2chart.htm
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post #3 of 6 (permalink) Old 06-11-2005, 02:09 PM
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Bubble per second are an individual measurement for each tank. Start slow and go up to where you need to be to get the CO2 level you want.
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post #4 of 6 (permalink) Old 06-11-2005, 03:04 PM
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also, a little trial-be-error find that I discovered is that once you know what your co2 is, if you want to increase your co2 by say 25%, it is not as easy as just increasing your bps/bpm by 25%. In my tank to raise co2 by 25% I only have to raise the bubble speed by just 1/2 of that. I am sure it has to do with the factors causing co2 loss (i.e. surface agitation, etc).

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post #5 of 6 (permalink) Old 06-11-2005, 04:53 PM Thread Starter
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How many bubbles per minute do you guys think would get me close to normal ppm for a 55g? I know there are MANY determining factors which you have to take into account, but Im just curious about where to start while trying to get an optimal level set.

Also, why does my bubble counter slow down over time? When I set it at night, Im lucky if it's still putting out half that when I check it in the morning. This is really frustrating. Something in the regulator seems to be choking down on the gas getting through over time. My tank PSI is still going strong of course. Do I need to close my regulator valve down more? Thats really all I can think of...
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post #6 of 6 (permalink) Old 06-11-2005, 05:11 PM
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i had to put my regulator at 25psi (rather than the 10psi recommended by Milwaukee) for the same reason; slowing bubble count. Have not had a problem since.

In my 50g tank (estimated 40g's of water) I have 80bpm going. ~1.33bps. And I have about 40ppm co2.

Still go slowly. Start at 1/4 of that. Wait about 3-4 hours. Increase again. repeat. Until get to the sweet spot.

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