DIY co2 diffuser
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Old 05-28-2004, 12:49 AM   #1
edo
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DIY co2 diffuser


what kind of foam do u put at the end of my gravel cleaner?
and would one 2liter bottle for yeast be enough for a 20 gallon long tank?
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Old 05-28-2004, 01:52 AM   #2
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I use some extra foam from an Aquaclear HOB filter. I just cut it into a "square"..snipped off the actualy corners and jammed it into the gravel tube about 1 cm from the end of the gravel vac tube. As a filler to break up the CO2 bubbles I have some bioballs my LFS gave me and part of a plastic dish scrubbing pads you can find at any grocery store.

I'm pretty sure one 2L bottle will be fine for a 20g tank...but I'll let someone else chime in. I have 2 bottles running for my 46 gallon.
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Old 05-28-2004, 04:02 PM   #3
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I don't even use a sponge/foam in the end. eventually it gets too soft and gets blown out, unless you run a piece of rigid tubing all the way thru.

I found that when I removed the foam, i had to decrease my bubble rate a tiny bit (about 10bpm) because I got better dissolve rates.
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Old 05-29-2004, 08:20 PM   #4
russdesnoyer
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Hey Malk,

I always wondered about this--do you really need the sponge at the bottom of a power reactor to get good CO2 diffusion? I've found these sponges to be a pain in the butt to keep clean and in place within the reactor chamber.....would be nice to do away with 'em if possible.....

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Old 05-29-2004, 09:54 PM   #5
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I would think the sponge could serve as a bio-filter of some sort? Maybe I'm wrong. When I didn't put the sponge there I always saw small micro bubbles coming out of the bottom of the tube...don't want to waste any CO2
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Old 05-30-2004, 01:59 AM   #6
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You don't need a sponge, assuming the powerhead is sized correctly to the reactor (more flow -- needs wider reactor/bottle/whatever).

You don't need bioballs etc either...

If you create a "vortex" current in the reactor, by angling the power head output, even less bubbles escape the container. The few tiny ones coming out of the bottom look like wasted, but their volume compared to what is dissolved is really negligible.

Dump the sponge, I'd say
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