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Discussion Starter · #1 · (Edited)
My experience with the usual inline DIY reactor has not been satisfying. The bubbles escape the reactor when the flow is 110 gph, even if the reactor is 1-1/2 ft. long and a limestone is used to inject the gas in the reactor.

The following reactor is using a strong circular water motion to disolve the CO2. The only commercial CO2 reactor that I know of that uses the same principle and no powerhead is internal and fails to work well with high flow rate and high bubble rate.

Here are some pictures:
http://www.aquaticplantcentral.com/gallery/showimage.php?i=1164
and click "Next picture" to see the progression.

The reactor is external, inline, and it's meant for very high flow rates. I'm testing it with 150 gph and 1 bubble per second of CO2 and it works perfectly - no gas accumulation for the last 6 hours.

The cost for the parts is only about $15 or less. The acrylic canister seems to have a very reliable seal - I've used 3 of them so far and none have leaked around the silicone gasket.

A future improvements (if I don't loose interest) a nipple on the canister lid for CO2 injection so the unsightly T would be gone.

--Nikolay
 

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Discussion Starter · #4 ·
The canister - any store that sells kitchen stuff or hobby supplies. Target, WalMart, anyone.

--Nikolay
 

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Discussion Starter · #7 ·
After running the reactor for a week with 2 bubbles per second and a powerhead rated at 150 gph it accumulated about 75% gas in the canister and required bleeding to keep working.

The pH stabilized at 5.7 (@ KH=4) and never went lower than that. I don't know if the gas accumulation is due to saturation or just ineficiency. Also - the total water volume for the test was about 3 gallons with almost no surface agitaion. Maybe there was not enough CO2 escaping the water and allowing solubilization of more gas.

That is where I'm at in the moment. Seems far from say a 500 gph, super-duper, 100% solubilization, external reactor :-D

--Nikolay
 
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