These modifications will make your Cerge's reactor more effecient and should save you some CO2 gas with a very quick response when you open up your needle valve.
This is how it works, the water and gas enter the upper chamber and start to mix in the churning water and the whole time the mixture is leaving the reactor via the large center tube in the bottom chamber, so it is constantly pulling the mixture downwards through the sponge/scrubby in the center which will not allow any gas bubbles to enter the lower chamber. The pump is not
conected to the center/exit tube, the pump sucks in the gas/water mixture pushes it through the smaller tube and back into the top chamber, this extra churning/aggitation is what makes the unit so efficient.
The center tube should be cut on an angle that is great enough to allow about one half inch of space between the pump and center tube, this allows you to put the pump againt the center tube without any risk of the gap closing, the pump outlet tube should be somewhat ridged so you can use atleast 3 wire ties to hold the pump tube, center tube, & pump power cord (not shown) together neatly, you will also need to get the power cord through the lid of the reactor and make a water tight seal.
I have not figured out the power cord and how to make the seal in the lid, but the parts are out there somewhere and it may mean you have to cut the plug off of the pump and re-attach it properly with solder, shrink tube, etc., I urge you not to try any eletrical modification unless you have the needed skills, this is going into and around water and has the potential to hurt or even kill you if it's not done properly.
Good luck and please post any modifications or part suppliers you find, thank you.