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How will co2 effect a canister filter?

If you inject co2 into the intake line of a canister filter will it screw up 
the impeller or make a lot of noise with co2 comming across the impeller? Do 
you have to install a check valve  in line to make sure that the co2 goes 
into the filter not the other way? I'm thinking about using an Eheim pro 11, 
would this be a good idea? Thank You--------JACK