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How long have you waited for it to build up pressure? I say this because with a CO2 tank we run around 10-15psi, that's not a lot at all... To break a soda bottle you will need a lot more than that. If a yeast setup can burst a bottle, and trust me it can, there should be no reason why it can't push CO2 through the glass diffuser. That is if you find a good way to seal the airline tube to the bottle lid. If your connections and seals can stand the pressure, the bottle and airline tubing certainly can.

Giancarlo Podio
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