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Re: Silicone tubing and CO2

> - - Blow up a ballon (with respiratory CO2) and attach it to a length of air
>  tubing with a diffuser on the end (possibly in an inverted plastic cup)
>  under the water surface.
Not worth the effort.  Exhaled air has a very low percentage of CO2 content.  
Unless the balloon were the size of a mountain, you couldn't put enough CO2 
into the tank with this method to matter.