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Don't sweat it, that likely is not CO2 but rather oxygen. O2 can build up in a reactor of these designs and can remain there for a while.

CO2 will dissolve very fast. If you have a pressurized system try flooding your the reactor with the gas and watch it all disappear within seconds. I've done this with a pH probe placed at the discharge end of the reactor and observed a 0.3 pH drop in a less 10 seconds. The CO2 really dissolves that fast.

BTW thanks for the picture. That helps a lot!
 
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