Liquid filter? is that the same thing as a canister filter. It's air tight with not oxygen in the mix. Any canister filter will do as long as the return spray bar doesn't stir up the surface of the aquarium where the Co2 and oxygen exchange. That way the Co2 will remain the the water.
I use a Filstar XP1 with a DIY yeast Co2 attach to the intake of the filter for my 55 gal plant tank.
I had it set-up for a year and it works great. The total cost is $60 buck.