Cheap Inline CO2 diffuser - The Planted Tank Forum
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post #1 of 16 (permalink) Old 12-19-2008, 05:17 AM Thread Starter
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Cheap Inline CO2 diffuser

I was thinking of something when I was feeding me fish.

So when I get my new Eheim, I could cut the outtake tubing somewhere and wedge the tubing of DIY CO2 into there, which will diffuse by the time it gets to the tank. I have a couple questions about this:

1. Will it work (as in diffusing CO2)?
2. Since the water is flowing at such a high rate, will it create a vacuum (or something) and suck out the contents of the DIY CO2 bottle?
3. If I do this along with sticking tubing into the intake of the filter, will this be too much CO2?
4. Should I quit being cheap and build a Rex reactor?

Thanks for your time!

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post #2 of 16 (permalink) Old 12-19-2008, 05:57 AM
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I choose.........Door #4!

I'm pretty sure that if you just bubble the CO2 into the output of a canister filter, most of it will arrive at the tank as CO2 bubbles, too big to survive in the tank more than a couple of seconds before floating to the surface and bursting. With DIY CO2 you have a very hard time getting enough CO2, so avoiding waste is much more important than with a pressurized system.

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post #3 of 16 (permalink) Old 12-19-2008, 06:09 AM
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Quote:
Originally Posted by ZooTycoonMaster View Post
I was thinking of something when I was feeding me fish.

So when I get my new Eheim, I could cut the outtake tubing somewhere and wedge the tubing of DIY CO2 into there, which will diffuse by the time it gets to the tank. I have a couple questions about this:

1. Will it work (as in diffusing CO2)?
2. Since the water is flowing at such a high rate, will it create a vacuum (or something) and suck out the contents of the DIY CO2 bottle?
3. If I do this along with sticking tubing into the intake of the filter, will this be too much CO2?
4. Should I quit being cheap and build a Rex reactor?

Thanks for your time!
1. Yes but poorly IMO and you might encounter leaks.
2. Yes most certainly
3. Might be, that depends upon your mixture. You could also diffuse it BEFORE your intake by placing a diffusser under the intake strainer. You will get a much better reaction that way.
4. No!
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post #4 of 16 (permalink) Old 12-19-2008, 07:10 AM
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Sorry but...
If the co2 bubbles into the hang-on filter to diffuse the co2, my question is will the co2 degass by the time it gets to the aquarium?

didn't mean to go off the topic of your thread...

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post #5 of 16 (permalink) Old 12-19-2008, 09:34 AM
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Quote:
Originally Posted by chikit2370 View Post
Sorry but...
If the co2 bubbles into the hang-on filter to diffuse the co2, my question is will the co2 degass by the time it gets to the aquarium?

didn't mean to go off the topic of your thread...
It won't be as efficient. And might/might not work at all. Depends on how you're actually introducing the bubbles.
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post #6 of 16 (permalink) Old 12-19-2008, 01:34 PM
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#4.

Ask around or post a WTB. I got mine used for $10. Works great on the outflow of my eheim 2026.

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post #7 of 16 (permalink) Old 12-19-2008, 02:19 PM Thread Starter
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Well yeah but the problem with the Rex reactors are that they're too big (they're at least the length of my tank), and I only need it to be like 6"

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post #8 of 16 (permalink) Old 12-19-2008, 02:33 PM
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post #9 of 16 (permalink) Old 12-19-2008, 09:57 PM Thread Starter
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But the Rex reactors also have the CO2 intake going into the output...wouldn't that create a vacuum too? Or are the reactors for pressurized CO2 use only?

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post #10 of 16 (permalink) Old 12-19-2008, 10:44 PM
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In my 10 gallon tank, I use an Eheim 2215. Just past the output side double tap connector, I drilled an 11/64" hole. I stuck the CO2 tubing into the hole, pulled it through with some needle nose pliers, and that's it. That is my reactor/diffuser. I put about 3bps in this tank, and get very little mist out of the spraybar. With DIY Co2, you probably won't see any mist at all.


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post #11 of 16 (permalink) Old 12-19-2008, 11:38 PM Thread Starter
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but you have pressurized right?

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post #12 of 16 (permalink) Old 12-20-2008, 12:24 AM
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Yes. And you have DIY.


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post #13 of 16 (permalink) Old 01-06-2009, 05:29 AM
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eyebeatbadgers got any pics if your inline co2 set up?

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post #14 of 16 (permalink) Old 01-06-2009, 06:48 AM
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EBB, you get CO2 mist by simply bubbling the CO2 into the outflowing tubing?

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post #15 of 16 (permalink) Old 01-06-2009, 09:21 AM
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Logic would say, that if you made a rex reactor that's like 3" wide rather than 2", it would not need to be as long as traditional RRs, as the flow through the reactor would be less, giving the bubbles more time to dissolve. Then again, would all depend on the gph of the canister you're using too. I could be talking out of my a$$ but definitely worth the experiment IMO.

I don't see how bubbles that are rising w/ gravity already, and going through an upwards flowing tube, would dissolve much at all.
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