Hi Chin
My first CA reactor used the up flow method. The mixture of water and CO2 caused large bubbles to form under the media. The media would the burp and the system would then release cloudy effluent into my tank. My tank was always muddy looking. It drove me crazy.
I then sold it to some other Reefer and bought an OA Reactor. It's flow is down, no burping however I see a mod is required as it wastes CO2. the mixture of water and CO2 is injected in the top of the camber and the exit for the effluent is also in the top of the chamber. This takes a lot of the CO2 strait out of the system without circulating it through the media. I am going to mod this for better efficiency.
Come on over and you can see for your self.
Tom R
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