Originally Posted by happi
i don't know much about sump, but, i do know that it will take out lot of co2. with the high flow filter you must use 20" or higher housing and use a sponge inside it, this will help the co2 from escaping and you also get better diffusing this way.
I suspect that my sump wont' be causing much CO2 loss. The way my Herbie overflow is setup, no air at all goes into my overflow. It's practically a full siphon.