Oh... and if forgot: my inline reactor is empty :shock:
It's actually a gravel vacuum tube, and since it is wider than the rest of the filter tubing the water speed is reduced, and the CO2 bubbles just dance around until the get so small that they are sucked into the filter where they totally dissolve. Bioballs or whatever would reduce this width, increasing the water velocity which would suck the bubbles just through the reactor (I think).
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