I think it was that one
nice find.. But it doesn't contain the paper i refering to.. I know i posted it somewhere, but i lost all my bookmarks due to a HDD crash sans backup.
If i rmember correctly it was via google books, but it's to long ago. The principle is actualy very simple.
Think of a Carburator and it's spray nozzle, this sprays gasoline mist into a venturi, when the trottle opens air flow is increases. Than there is a pressure build up in front of the venturi and the gasoline mist is sucked in by the acce;erated air flow into the venturi. Behind it this flow suddenly drops again, results in pressure drop and the air expands again rapidly and this scatters the gasoline droplets into even smaller size so it turns into a gas form before it hits the combustion chamber.
That's the excact same thing fluid dynamic principle. Air mixing gasoline, is fairly the same as water mixing with CO²..
The diffuser (air stone) is your spray nozzle that should be in front or in the venturi.
So the venturi should be behind the diffuser, than the already partialy diffused into small bubbles CO² hits the venturi, it gets more or less compacted together and accelerates in the ventiru, than the tube get bigger again all media leaving the venturi expands again and this kinda rippes apart the CO² molecules into even smaller fragments. Better disolved before it hits the (combustion) tank.
And yes loss of turn over without up grading the pump is inevitable.. A bypass could have possitive effects but i guess you still wil lose some. As the article i linked to states the lowest they tested it on was 4L/m = 240L/h still had a 100% beter result than a airstone only. Than we don't use a regular airstone but a very dense ceramic disk making far smaller bubbles than an airstone.
As said i never realy builded something to see how it works for real.. Currently no high tech tank to play with. Ran out of co2 and didn't feel like buying a new one. The next one i will surely go and experiment with this. For it's a proven theory, need to come up with something to scale it down so it's applicable for smal aqauriums. It works like a charm for the big ones, florestas submersas uses it.