The link below should help to clear it up, see all parts. I only run mine at 50mg/hr, with no air dryer, and I only use it for a couple days at a time to clear up the water as needed. I don't have an air pump, I just let the suction of the skimmer pull the ozone in. I try to keep it simple that way. Every system is different, that's just how I do it. The skimmer works more efficiently when running with ozone.
http://www.saltwatersmarts.com/ozone-aquarium-water-clarity-part-1-3705/