Re: CO2 reactor

> I looked at some of the reactors and even the fancy ones just had a
> spiral shaped glass tube which allowed bubbles to slowly escape out
> the top to the air. 

This sounds like the AquaLine Bushke (or however it's spelled).
> Do any of the commercial reactors employ more
> active methods for dissolving the CO2?

The Dupla "Reactor S" (or "Reactor $" :-) has a venturi nozzle to mix
the CO2 and water at the top and ceramic "saddles" or mini BioKaskades
to help mix it.  These are very efficient ... and expensive.