I run lines to all my skimmers from outside air compressors. i have a total of 4 compressors that run in tandem and pressurize 1000 gallons of air tanks to 200 psi outside. I run oil free compressors.
inside the air first runs through an air dryer, UV filters, micron filters, then carbon filters, then co2 scrubbers. Then runs through a two regulators. The first reduces the pressure to 30 psi and I have a "clean air" storage tank at that pressure. Then I adjust each skimmer with a regulator to get the exact air exchange I want for the tank.
I also use the same air for my phyto plankton and pod stations and the QT tanks.