Been there. Had the connection blow clean off once. It was immediately obvious - water everywhere. Beer turned out fine. I believe, and it's just my optimism here, that I've run so much water through the hose before I ever get to chilling (cleaning, filling mash tun, etc) the hose is pretty well rinsed. Don't get me wrong, I wouldn't want to add too much. But you're right, I think. 2-3 ozs in 5 gallons of 200* water probably took care of itself.