Note, you can easily modify the cerges reactor to be a dual stage venturi like the article:
http://www.barrreport.com/showthread.php/3444-Dual-venturi-DIY-External-CO2-reactor
This yields the best of both worlds, giving you a purge effect if the reactor fills with either air or too much CO2, and 100% mist free operation otherwise.
By setting the second 3/16" rigid tubing depth say at 1/2 the depth of the reactor, the venturi and thus misting effect will NOT occur until the gas build up reaches that point, so you have little or no mist of any sort.
The 1st 3/16th rigid tuvvign is your bubble counter and your CO2 input. The venturi line is used ONLY when there's excess gas build up inside the reactor.
You can also add bioballs etc, inside the break the water up some more, mix better and trap more microbubbles etc.
This way your tank does not look like 7UP and if the CO2 mist does occur, it only happens for a maybe 2-3 hours in the latter part of the day.
This is quieter, less haze inside the aquarium.
For most users, switching over to this method should not require any real adjustment for the CO2 and likely would stabilize the CO2 for a more mesa like shape.
This is because once the venturi kicks in after the build up, the CO2 is atomized and by passes the reactor and is degassed. So less build up of gas.
It also reduces noise if you use the return pump for the venturi, I have always tried to use just the Needle wheel specific powerhead inside the sump as this seems to work better and produces less mist, but I will likely switch the reactors all over to this method as some point.
So instead of the PVC and clear PVC builds, you use a clear water filter, or.............you make a nice custom clear PVC etc reactor your self.