Compact External CO2 Reactor with Venturi?

[Trickerie]

Im planning a compact version of the external venturi reactor for a 20Long. The reactor will probably be no bigger than 12". I have a few questions.

1) Will this powerhead work? http://www.marinedepot.com/Eheim_12...uarium_Powerheads-Eheim-EH1212-FIPHAD-vi.html
It has an air integrator, is this the same as a venturi? I assume it is. Does it have enough flow for a 20L?

2) What about the outflow tube, what goes on that? As I understand it, water is pushed through the reactor using the powerhead, and then exists out the other end, but what does one use to disperse the flow?

Thanks

 

[Tom Barr]

I'd use a Rio 180 pump myself, they are small and easy, cheap etc.
Reactor tube only needs to be maybe 8"x2".
Add a few bioballs

 

[Trickerie]

Thanks Tom :] Ill take your advice!