Originally Posted by aokashi
I've never seen a CO2 diffuser that creates significant turbulance. The flow should not be allowed to be that great either. If CO2 diffuser created water distubance, it will defeat the purpose of CO2 injection and prove to be counter productive....
The scenario is basically replacing a CO2 tank with something like an airpump and a control valve that brings in atmospheric air at a controlled rate...
does that make more sense or are you still thinking airpumps, airstones and lots of water movement?
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I didn't say turbulence, I said disturbance. I understand exactly what you are describing. All that is different is that you are going to try to create much smaller bubbles, these are a disturbance by their very nature in the water column. They are little pockets of air and will still absorb CO2 from the water the exact same as air sitting above the still surface or air being forced through the water while being shaken in a jar. The only difference is that as the bubbles get smaller and more numerous given the same volume of air injected, you create a larger surface area for this transfer to take place. It's not actually the disturbance itself, it's the presence of the air in that space.
Here's another way to look at it.
Consider that a CO2 bubbler adds bubbles that are close to 1,000,000 ppm CO2 whereas air, even from a highly carbonated residence might reach 1,000 ppm. If a CO2 bubbler might add a few ppm (I'm not certain how much but I would guess maybe as much as 5ppm, more than that would start harming the fish) to the water based on a 1,000 times greater concentration of pure CO2 than in air... What the heck do you expect to inject from air? It is somewhere around 800,000 ppm nitrogen....
Even the relative math doesn't allow for it to work.
Go ahead and try it out, just be sure to test properly so you know what is happening... I can already guess the results though.