Powerhead C02 diffusor? - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 09-06-2010, 07:48 PM Thread Starter
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Powerhead C02 diffusor?

Needs some advice, i'm about to set up my first DYI C02 system, i've read that one of the better methods of diffusing CO2 is through powerhead, my question is what happens once the powerhead is turned off, will co2 still get into tank and diffuse? Is there a possible pressure buildup at the powerhead? or should i've use an alternative method a self made bell method?

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post #2 of 8 (permalink) Old 09-06-2010, 08:22 PM
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Once the powerhead is off, CO2 does not get injected anymore, it just escapes to the surface.

There is no pressure buildup (powerhead isn't a closed system) but CO2 might collect in the impeller chamber and on startup it might run dry and self-destruct after a while.

Ways around that:

- Don't turn off powerhead (not good if you live in an area with regular power outages)
- Design a way for the collecting CO2 to escape without collecting in the impeller area
- Attach the CO2 line to the outside of the powerhead strainer, so that it gets sucked into the PH when it runs, but just bubbles to the surface when PH is off

Diffusing via a bell isn't very efficient. Using a (Hagen etc) bubble ladder is another way to diffuse CO2 in smaller tanks, but it comes with its own set of issues.

If you have a HOB filter, you might be able to use that as a reactor.


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post #3 of 8 (permalink) Old 09-06-2010, 08:23 PM
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When you use a powerhead as a diffuser, the bubbles go through the pump rotor, getting chopped up into lots of very tiny bubbles. When the powerhead is off, CO2 just floats in big bubbles to the surface, doing very little dissolving. That's what makes the powerhead idea work so well with DIY CO2.

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post #4 of 8 (permalink) Old 09-06-2010, 08:44 PM Thread Starter
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Quote:
Originally Posted by Wasserpest View Post

- line to the outside of the powerhead strainer, so that it gets sucked into the PH when it runs, but just bubbles to the surface when PH is off
i think i will go this route, i'm working on it right now...thanks
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post #5 of 8 (permalink) Old 09-06-2010, 08:49 PM Thread Starter
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Quote:
Originally Posted by Wasserpest View Post

If you have a HOB filter, you might be able to use that as a reactor.
yes, i do have an HOB filter, i know it causes C02 to escape rapidly and i will upgrade to external canister filter at some point, but for now just curious if i diffused CO2 with HOB im assuming i would need to attach the CO2 line to the outside of the HOB strainer to make it work just like with powerhead?
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post #6 of 8 (permalink) Old 09-06-2010, 08:50 PM
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Exactly! Depending on the exact model this might work or not, and you might be disturbed by the noisy plop that each bubble makes when it hits the impeller.

I used an AquaClear HOB for many years for this purpose and it worked just great.


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post #7 of 8 (permalink) Old 09-06-2010, 09:50 PM
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I used a very small powerhead for a diffuser in a 10g. I have now switched to a small glass diffuser due to space/aesthetics.

What I did was mod a couple pieces together using locktite. The end product was the hose came into the powerhead, and then was chopped, and then pushed out a tube facing down into the aquarium, the last thing it does is get squirted through a fine mesh. The bubbles were actually finer I think than now with my glass diffuser.

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post #8 of 8 (permalink) Old 09-07-2010, 07:00 AM
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You can also mod the impellar by snipping the blades and making a diy needlewheel ph.
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