Ok, I think I want a closed loop cerges. Basically I want to fed my CO2 directly into a 350 gph pump (owned) with modified impeller, have that water enter into my blue 20" filter housing (owned) in reverse so it enters into the pipe instead of the main housing. Here are the questions about that!
1. I have a 20" housing (this one
) which I believe has a pressure release button. I noticed most people use a clear housing for obvious reasons but I already have this one and if air builds up I would be able to hear it right?
2. Normal or reverse flow - I've seen people do it both ways but mostly normal. A (normal) - water enters main housing, travels to the bottom and exits up through the middle pipe. B (reverse) - water enters through the center pipe, down and out through the main housing. Option B makes sense to me cause that smaller surface area means the CO2 is getting hit constantly, in option A if the CO2 bubbles would naturally be pushed to the opposite side of where the water is coming in and thus not be getting slammed by the water flowing in until the co2 built a bit to cover the entire top of the housing. Poor drawing attached.
3. Pump/CO2 Injection - What size pump do I want? Should I inject the CO2 INTO the pump to chop it up? Or better to inject inline after pump? Or directly into housing?
BTW I should mention I am not looking for 30ppm of CO2, more like 10-15 maybe so the amount of gas won't be large. Medium light tank with hardwater plants and fish so I want to keep the pH up above 7.0 which as far as I can tell means I need to keep the CO2 lowish. well water is pH - 8.2, KH - 10, GH - 10.