I have a 4 inch griggs style reactor on my 75g. It has two Sunsun filters putting out around 1000gph combined, probably less with the plumbing. For the most part it works great as a co2 reactor. Even turned way up no large bubbles are able to form at the top because of the cone shaped coupler on top. I wanted to build it to be a very low maintenance reactor, without media in it so I wouldn't have to take it apart to clean it all the time. I also didn't want to put any back pressure valves on it which I think just kill the flow.
While it does work, I would like to improve its efficiency at chopping and dissolving the co2. I thought about somehow mounting a circulation pump inside near the top so it would chop up the bubbles, or possibly off to the side so it would cause a spinning effect like a tornado. But most submerged style pumps need their magnetic cleaned often which would mean dismembering the reactor.
I was thinking about a pump that I could mount outside the reactor, that could have its intake drawing from the top of the reactor where the bubbles are, thus chopping them up, then pushing them back into the reactor. That way I could clean the motor without removing the reactor. Or some kind of motor with a shaft that goes through the side of the reactor with some sort of spinning blade inside.
Anyone have any ideas? This reactor is on the intake side of the filters and is plumbed with a one inch pipe before the reactor so co2 diffusers won't work without a redesign. Below is a picture of the reactor. Thanks for any suggestions!