Yeah i figured it wasn't a canister filter, but what I wrote came straight from the box. For it to be a CO2 diffuser, I already know that I'm going to have to remove the filter media inside it. Then i'm adding bio-balls. I'm positive this will provide much more efficient result rather than just feeding a tube up a hangon filter pipe.
So...it's not bad for 23 dollars now. And when i get an ocean tank in the future, I can always disconnect it and add the filter back in and use it for that tank.
Maybe my idea is all wrong, but I want to work with what I can get. I'll do my best to show that this can work as a reactor/diffuser setup.