Although I've never plumbed my CO2 into the inflow line of my filter, I know that some people do...some people say it will/can present problems (air trapped in filter, noisy, etc), but others seem to not have a problem with it. And I wonder how effective your filter would be at breaking up those CO2 bubbles anyway... you may have a micro-bubble explosion if you do this, but I'm not sure. Anyone else, perhaps with experience doing this, care to share?
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