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I use a powerhead rated at around 120 gph (that may not be accurate). I took an undergravel filter tube-topper (the thing you'd normally put an air hose into) and attached it directly to the powerhead (inverted) and inserted my CO2 tubing into that. The powerhead was originally used for circulation, so I don't count it as a cost, and I already had the UG filter parts from a previous set-up.
The CO2 bubbles get sucked up by the powerhead intake and chopped into tiny bubbles. This has worked very well and gets CO2 across my 4' tank easily, but I do not know what the efficiency would be rated at. For me, "it works good, and didn't cost anything."
-Dave
The CO2 bubbles get sucked up by the powerhead intake and chopped into tiny bubbles. This has worked very well and gets CO2 across my 4' tank easily, but I do not know what the efficiency would be rated at. For me, "it works good, and didn't cost anything."
-Dave
