Thanks Antony for your quick and useful answer.
I'd like to know if the carbon that I have to use for the air outflow, over the collection cup of my skimmer, can be that which I use normally for the aquarium use or it has be a particular kind of it for air use?
And how much carbon I have to use under my skimmmer water outflow?
Thanks again for your precious help!
best regards
Ciao
Lorenzo
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