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CO2 outgassing in cannister filters

Karen and APD:  

I was browsing through the archives where you said that a cannister
filter would outgass more than, say, a biowheel setup.  I have an Eheim
setup with the spraybar underwater, aimed away from the surface of the
water, which I thought would cause little to no outgassing compared to
another setup.  Can water movement underneath the surface of the water
(which is without ripples) cause significant outgassing?