Dual Venturi Diy External Co2 Reactor

I'm using it this way for a month now and this method works really really well compared to the the out of the box design

 

I think I could benefit from a reactor like this... Right now I am injecting CO2 into my canister intake and I don't think it is very efficient.

The thread is so old that many images have expired, and I don't yet understand how the reactor operates, all I know is I really like the idea of a HOB unit that does not require me to fiddle with my canister. If anyone can post pics or videos, I would appreciate it.

 

Resurrecting an old thread to ask one question.
I have drilled the Venturi to the side, 2” from the top.
Tubing and irrigation drip valve is connected .
Should I let the valve slightly open to allow a drop of water a second to come out of the Venturi or should I just have it closed and release it at the end of the day for maximum performance from the reactor?
Thanks!