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CO2-cannister filter

Can anyone tell me how to go about injecting CO2 into the intake in a
cannister filter? I've read that cannister filters (at least Eheim ones)
make efficient CO2 reactors. Is there a hose coupling available or is this
something that needs to be DIY'ed? That concerns me because I'd hate to have
a failure and have 55 gallons of water pour out onto my floor.