Hey bro, I've been thinking about running a CO2 scrubber with some carbon before that attached to my skimmer intake. Is that what you are talking about when you said you run an air filter on the intake side of the pump? Or were you suggesting to run the carbon before the luft pump? I'm going to get 2 ?CO2 scrubbers to run in line, but was unsure if I should run them before the skimmer or the luft pump.