I was thinking of putting a hop back in line with my whirlpool chilling process. (Pumping hot wort out of the kettle through a hop back and back into the kettle with an immersion chiller running in the kettle). Should I be concerned with that first blast of hot wort going into the hop back and getting oxidized by the air trapped in the hops?
Maybe it would be best to chill some first, then go through the hop back. But then I'd be worried about contamination and maybe poorer aroma extraction with the cooler wort.