I don't know that particular filter, but can't you just run your CO2
line into the intake strainer?

Matt C. wrote:
I got a Rena Filstar XP1 for xmas for my 29 gallon planted tank. I
would
like to inject my DIY CO2 into the filter so the impeller breaks up
the
bubbles. is there any way i can rig this filter to do this? I used to
have a
small powerhead that i bubbled into and it worked really well.

Any suggestions?

thanx,
Matt