I've got a closed loop 75 gallon tank with a iwaki pump (700+gph) and ocean clear filter. I also have a heater inline after the filter. Currently, I have my CO2 simply T'd into the line before the pump and it appears that all of the CO2 is dissolving. I'm pumping a lot (more than I can count) of bubbles and still the drop checker is not a nice green. If no CO2 is coming out my filter output then why am I not getting good CO2 levels? I can hear the CO2 get churned up in the iwaki pump so I know that my CO2 is not leaking out.

So...I am thinking about hooking in one of these reactors inline with this system. First, with my high flow, can I effectively use this reactor? I do not want to toggle down the flow to the tank. If it will work, how long should I design the reactor chamber t to be? Also, where would I link in the venturi line? My thoughts are that if I hook the venturi line in before the pump the bubbles will never make it into the tank anyway because they do not even make it into the tank now without any kind of reactor. Or should I just hook the venturi right back into the reactor? My thoughts are here that without any kind of pump to churn up the bubbles fine this will also not be very effective.

Here is a couple shots of my system before I setup the CO2



Here is how my CO2 system stands now...the CO2 line simply is T'd into the inlet before the pump


I'm sure another option is to put some Y's into my line and run another seperate pump dedicated to the CO2 reactor...this would require me buying another pump which I would rather not have to do unless completely necessary. With all the "stuff" I aleady have "inline" mabye this is not such a bad idea to prevent flow losses.

Also, is there another option for CO2 dissolution that I should look into? Keep in mind that I do not want to add any hoses or lines that go up and over the top of the tank. My tank is rimless for a reason - to keep all the equipment out of the tank

All opinions welcome!

Thanks for any help.
Matt