Direction of flow in a DIY CO2 reactor.
I am making a C02 reactor to accompany my sump. I have 11 inches of 1.25 inch PVC, with elbows on the end and reducers to my pump tubing. I have a couple of questions, just to make sure I do it 100% right. I attached a schematic.
Firstly, does it matter is the water enters the top of the diffuser (it is vertical, of course) and exists the bottom? Or does the water need to travel up for the system to work properly? I have seen many examples of DIY reactors, but none of them mentions which side is input, and which is output!
Also, my understanding is the CO2 input line should enter at the top of the diffuser, with the line running down to near the bottom. Is that correct?
If I want to add a venturi loop, it should go on the side near the top, and run back into my pump input, correct?
Last, is 11 inches long enough?
For additional info, the pump is running from my sump, through clear tubing, probably at about 400 GPH. I would rather have the input in the bottom because it simplifies my plumbing a bit. The output will run up the tubing.
Thanks for any advice : )