Thats what it appears the Deltec and H&S versions do, but they don't use Co2 AFAIK.
Here are some shots of the H&S
I would like to see if you can run two phosban reactors on a daisy chain and get the same effect?? Maybe put a labcock on the end of the output so you can have percises control of the effulent....
Great looking reactor by the way!!! Barr makes some great gear!!!