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Old 01-13-2013, 10:11 AM   #1
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DIY CO2 Questions

I started making my CO2 reactors yesterday and will be setting it up at my 10 gallon planted tank at work. I have a 2 liter bottle with a piece of tubbing going through hole to a check valve to a 500mL that will have so water in it to act as a counter/gas chamber. Then there will be another check valve coming off 2nd tubbing from 500mL going to a cut in half 500mL with sponges that will be in aquarium and positioned underneath intake of filter. My question is should I epoxy around the tubes in the caps? Also should I epoxy the tubing around check valves? Do I have to many check valves? Any help would be appreciated.
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Old 01-13-2013, 11:56 AM   #2
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1 check valve is sufficient. I would add it between the tank and your gas separator bottle.

I would also recommend using silicon or epoxy around the place your tubing runs into the bottles. These things have to pressurize and any small leaks will negatively impact the effectiveness of your reactor vessels.

Welcome to AA by the way!
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Old 01-13-2013, 03:33 PM   #3
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Ok thank you very much. I figured 2 check valves might be too much. Will be epoxying the caps today after I switch out the one check valve.
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Old 01-13-2013, 03:38 PM   #4
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FYI on using Check valves with CO2: CO2 will eventually ruin a plastic check valve, so if you use one, be advised you will need to replace it every 6-12 months for it to be effective. You can find metal check valves which will last much longer, but they are also more expensive, and can be harder to find.
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Old 01-13-2013, 06:57 PM   #5
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Thanks, I'm more familiar with metal as I use to work with compress gases before but I knot what I am making is low pressure. I'm planning on using this setup for a 40 gallon I have until I have money for a tank set-up. The epoxy is set and will post pics when set-up. Will do on Tuesday as its at work and will be working a half day tomorrow and will have more time to set up then. Thanks for help.
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Old 01-15-2013, 12:53 PM   #6
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I got it going today, next batch I will have less water but here are the pics:


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Is the tank.



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Are the bottles with silicone lines epoxied to caps inside and out.


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A look of where CO2 enters water. The set-up is a 500mL bottle with suction cup stuffed with 2 sponges where the line from gas/bubble counter bottle comes at the bottom.


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The bubble counter/gas bottle.


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A better look at the DIY CO2 diffuser I mentioned.
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Old 01-15-2013, 08:04 PM   #7
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Interesting diffusion method.

Looks good -
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Old 01-15-2013, 10:57 PM   #8
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Is there a better method that's free? I'm increasing contact time as a pocket builds and eventually releases bubbles with most going into filter intake. I plan of getting a glass diffuser for my home tank but its there a more inexpensive way of doing it?
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Old 01-15-2013, 11:02 PM   #9
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Seems to me like this will be a good and inexpensive way to do it.
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Old 01-15-2013, 11:21 PM   #10
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I've done the same on my 36 bowfront with the exception of doing two 2 liter bottles and alternating them every 2 weeks. While not a perfect constant rate it does help to even it out when the other bottle is nearing its life. I have three check valves as well. Between the bottles and the separator (this keeps the pressure up while changing a spent bottle) and of course the one between the separator and the tank. Not I used plastic line because I heard that CO2 will leak through silicone. Any thoughts on this?
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