Carbon for intake

[tony1970]

im looking for a website that sells like a inline carbon filter that i can hook up to a berlin skimmer, found that by injecting fresh air from outside the house into the skimmer, that its helping keep ph up while running a co2 reactor.

Does anyone know of a website where i can buy an inline carbon filter for the skimmer or a good way to maybe make one if thats even better.