Hi, Last night I mini-kegged 5 gallons from cold crash and I am sending another 5 into cold crash today. The issue I'm having is that the temperature reduction from my ale ferment to cold crash temps, is resulting in liquid being sucked back up my blowoff hose. It gets about 1/2 way it seems, then when I want to be safe & get rid of that liquid in the hose by lifting the hose out of the blowoff liquid container which has iodophor in it, the liquid rises in the hose instead of falls. It's hard to see but I don't think I've let any get into the carboy. I don't know what iodophor actually tastes like and don't want to find out, so I can't tell whether it's in the beer or not, by taste. How do I prevent the negative pressure created by the cooling shrinking atmosphere in the cold crashing carboy, from sucking liquid back up into the carboy? Must I simply do cold crash only with aluminum foil over the top of the carboy? My next 5 gallons is in a pail, not sure how I can put aluminum foil over a pail grommet hole ! Thank you for any suggestions.