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post #1 of 4 (permalink) Old 11-13-2007, 06:32 PM Thread Starter
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Another CO2 Reactor thread

I recently modified my HOB co2 reactor to reduce the amount of gas buildup in the top of it. (Thanks to the forum for ideas!) The diagram below shows how the co2 injector is run to the bottom of the chamber, and at the top is a "recycle line" for any buildup.

My problem is that I don't think that the "buildup bubble" is getting drawn out and fed back to the filter intake. When I turn the system on, I can see the gas push through the recycle line, over the edge of the tank, then downwards into the tank about halfway to the filter intake. Then it stops. Not sure why this is -- maybe the negative pressure created by the xp3 intake is not strong enough??? If this is the case, how might I more easily create this "recycled" effect. What if I drilled a hole into the primer cap at the top of the xp3 pipe? Seems that might create less impedence for the gas to get fed back into the system....?

Thanks for any help!



-Ernie


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post #2 of 4 (permalink) Old 11-13-2007, 07:43 PM
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I don't think this would work... there is no real pressure differential. Both lines have roughly the same "negative pressure" and balance out somewhere as you noticed.

Basically the same thing as trying to pull yourself out of a swamp.

And a hole in the cap will just airlock your filter.


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post #3 of 4 (permalink) Old 11-13-2007, 10:04 PM Thread Starter
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Thanks Wasser, confirming my suspicions. Here are two alternatives I'm considering:

1. outletting the "recycle" line to the filter output.
2. Using an extra powerhead that is laying around, with a venturi attachment.

Any thoughts?

-Ernie


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post #4 of 4 (permalink) Old 11-13-2007, 10:55 PM
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1) Again won't work, you have positive pressure in the outlet and negative pressure in the inlet part, so water will move from the outlet hose to the inlet hose. This doesn't get rid of your bubble, it just reduces the filter output.

2) You could probably set that up so it works.

You might wanna ask yourself if there is a better way to get your external reactor to work. Maybe put it on the outlet. Maybe reduce the length or diameter so there is more movement or extra bubbles can escape on the bottom.


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