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is injecting c02 into intake of cannisters bad for them?

My question -
is injecting bubbles of c02 into cannister filter intakes bad for the
cannister.  Surely the pinging and small pockets of c02 cant be good for the
motor or impellor ? I just bought a new eheim 2224 professional and have
been injecting co2 into the outlet up a gravel vac part into liek a chamber
where is mixes.. this method is excellent but it totally kills my water
flow..  I'd liek to have the spray bar setup but dont want to risk damaging
my filter by injecting co2 into the inlet.. anyway have any suggestions ?