The RedSea units are "complete", they come with an Air Dryer which is just a inline container of silica beads that remove moisture from the incoming air. You can "recharge" the beads by baking them in the oven, but like I said, you better get a dedicated oven to bake your beads because they become depleted VERY fast in San Antonio humidity.

The instructions say to connect an air pump to push air through the generator, but I simply hooked my skimmer's air inlet to the ozone generator output and suction from the skimmer is working just fine.

I have a charcoal container on top of the skimmer so the air from the skimmer passes through some charcoal to remove excess ozone from the air. I am not passing the skimmer output through charcoal, but I have lots of sump space for any residual ozone to be depleted. If you have a small sump, I would consider charcoal in the sump where the skimmer output comes into the sump.