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Plumbing a Co2 Reactor


Apologies. I am trying this again because I think that it got lost in the
rest of the CO2 threads a few days ago...

I got my CO2 reactor in the mail and now need to figure out the best way to
plumb it in to my system. It is a low pressure type unit where pumped water
and CO2 enter the top, churn over some bio-media and then exit happily
intertwined as lunch for the plants.

I have a wet/dry sump under my 75g tank. The instructions call for a power
head as the water source. I can envision two ways to do this. Plan A is to
take a tap off of my return system and run it back to the reactor which
then dumps into the intake of the return. This gets points for simplicity
and keeps a power head from eating up sump volume however I would think
that there is an element of inefficiency because the water coming back to
the diffuser from the output is already freshly CO2 enriched. 

Plan B is to put a small Rio powerhead in the sump.

Any ideas. I like the idea of tapping the output because of it's simplicity
but do not want to waste CO2...

Thanks a lot,

Paul Mouritsen

mourip @ erols . com

Washington, DC