Originally Posted by Blue Ridge Reef
CO2 is injected on the output side, so I'd think worst case scenario is bubbles not being absorbed/spat into the tank whole.
These companies are known for selling undersized filters in kits, and even ones that cost over $1000 are no exception. But for what it's worth, the 205 has done really well for the dozen years I've run one on one of these (I put an Aqua Clear on the other and its 205 filter is still new in box under the tank). I do add a powerhead to these since the shape of the tank -and with huge driftwood -doesn't lend itself to good flow to begin with. But long and short of it is, I've dropped more $ on aquariums in the last year than I usually do in 5 years and buying two new canister filters when there are perfectly functioning ones sitting under the tanks are not something I'm going to convince my wife is a "needed expense" any time soon. These are the filters I have to work with. Unless you or anyone else thinks it simply won't mix CO2 at that flow rate, I guess I'll hook up the reactor and see what I'm able to get. If it doesn't drop pH, I'll have to go the diffuser route.
Heh I don't know why but I didn't notice you were the thread starter, I was replying like you didn't know the score :P
Anyway, I will say this, I am easily getting co2 dissolved in my rex griggs reactor. My filter is rated at 260 gallons per hour. So a bit more then yours. I am also however not getting complete dissolution. I definitely still get some micro bubbles getting blown into my tank from my canister filter. Is this being caused by too much flow through my reactor?? Or not enough?? No idea. I am actually planning to cut apart my rex griggs to make a new reactor of my own design in the next few weeks. Since you literally have all the parts lying around I would totally give what you have a shot. Worst case scenario is you get too much gas buildup and your reactor is thus too noisy and not very efficient. At that point its time to reconsider the approach.
And you are right, I am sure the powerhead will help out significantly with flow.