New Idea For Co2 Diffuser - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 12-30-2006, 11:56 PM Thread Starter
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New Idea For Co2 Diffuser

I changed the elements of my RO yesterday. Out of curiosity I cut open the membrane cartridge. I found that it contained a roll of paper through which I could blow across but when I held it under the tap water flowed over it and not through it.

This gave me an idea of a CO2 diffuser. Two concentric pipes, the outer forming a sealed jacket for inner, the inner a through pipe perforated in the portion inside the jacket and covered with the discarded membrane of the RO.

Now introduce the CO2 into the jacket and attach the intake of your filter or a power-head and return the water through a submerged spray bar. The negative pressure in the inner pipe will ensure the movement of the CO2 from the jacket to the intake of the power-head. The CO2 would have to form the smallest bubbles possible through the membrane and their cumulative surface area must give the maximum mixing.

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post #2 of 3 (permalink) Old 12-31-2006, 03:04 AM
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Sounds a bit more complicated than the more common solutions...

I am using 3 different methods - an inline reactor on a canister for my 100gal tank, a powerhead spraying mist or misting spray through my 36gal tank, and bubbles going into a HOB filter on my 10gal. All 3 pretty simple, no complaints.

Maybe your idea would be good for a much larger tank? Wouldn't the membrane clog pretty quickly though?


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post #3 of 3 (permalink) Old 01-01-2007, 10:45 PM Thread Starter
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If you have a CO2 reactor before your filter you dont need any other gadget Wasserpest, but those of us who feed the CO2 directly into filters or power-heads are pestered with noise.
I am building this diffuser for myself, and intend to hide it under the substrate. I am hopeing that once the bubble size is reduced, I will be rid of the noise and also the CO2 will get better dissolved.
As the only matter passing through the membrane is CO2, I am not worried of clogging of the membrane.
As for the gadget being complicated, I think not. Two small lenths of plastic pipes (1/2" & 11/2" in dia. and two reducing sockets. and some adhesives and a littlework with the hacksaw with three blades fitted together).

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