Hang on back CO2 reactor, super simple and cheap - The Planted Tank Forum
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post #1 of 5 (permalink) Old 09-07-2014, 02:35 AM Thread Starter
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Hang on back CO2 reactor, super simple and cheap

2x 1 1/4" PVC elbows
2x 1/ 1/4" - 1/2" PVC bushing
2x 1/2'' MPT x 1/2" FPT PVC elbow
3x irrigation 1/2" mpt x riser pipe barb elbow
1x 24" irrigation riser tube
1x T12 fluorescent bulb protector
pvc glue
teflon tape
razor blade
total cost about $10 for parts, pump had laying around.

The T12 fluorescent bulb protector is exactly the right size to fit 1 1/4 PVC fittings, it's also polycarbonate and damn near indestructible. Its just slightly larger to make it a super tight water tight seal without glue so it can be taken apart easily. Also the bio balls are small enough they fill the entire cavity of the elbows allow more agitation.
This can be made in any length, this is going on a 5 gallon tank since I'm having a hard time diffusing co2 through normal methods, the bubbles don't dissolve quick enough before hitting the surface.

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Last edited by chris_ranger; 09-07-2014 at 02:40 AM. Reason: forgot picture
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post #2 of 5 (permalink) Old 09-12-2014, 03:07 AM
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Curious if you get 100% co2 dissolved, and at how many bps?
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post #3 of 5 (permalink) Old 09-12-2014, 03:15 AM
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Each elbow fitting adds to the head loss, which actually reduces the flow rate. You have seven elbows! That might mean a trivial loss of flow rate, but it could also mean a major loss. You would need to measure the flow rate to be sure. Other than that it looks like it should work fine, in spite of not being able to have the CO2 bubbles rise through the water flow. I hope you will do some testing to see how well it works - what bbs it can handle, how much it can drop the pH of the tank water, etc.

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post #4 of 5 (permalink) Old 09-12-2014, 05:08 AM
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I'm skeptical this works very well. Gas will go through one end and out the other. It won't be suspended in any manner except trapped in the bioballs. A simpler solution is to pipe the gas into the inlet of the pump and let it diffuse that way.
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post #5 of 5 (permalink) Old 09-12-2014, 10:45 AM
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Interesting design. Where does the co2 go in?

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