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Re: Injecting CO2 into the intake of canisters

> 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 
>  motor or impellor ?

All I can tell you is from personal experience, and that I've injected CO2 as 
you describe into both canisters and power filters, and have never noticed 
even the slightest evidence of damage of any sort to the impeller blades.  
Eheim canisters seem to be better suited to CO2 injection because the motor 
is located after the media.  With Fluval canisters, a vigorous CO2 flow can 
be noisy, and can occasionally cause vaporlock of the impeller, stopping 
water flow.