I am brewing approx 35L of pale ale in a 50L closed kegmenter with pressure kit. I had a tube running out of the gas disconnect post into a bottle with 1L of stellar san as a blow off tube. I cold crashed but forgot to disconnect this line and hit it with some CO2. So it has now sucked back about 400mls of sanitiser into the fermenter that wasn't fresh. Is it ruined? Should I chalk it up to experience, please help.