I ferment in a 7 gal SS Brewtech brew bucket. I have the domed lid, the 3" tri-clamp cap that I secure with a tri-clamp. Out of the top of the cap, I have a 90-degree elbow with a 1/2" hose barb, and a 1/2" silicon blowoff tube that I put into a 3 cup mason jar full of liquid. All of that goes inside a minifridge so I can dial in the temp. It is easy to use, and easy to clean setup. Here is my problem...
When I lower the temp in the fridge to lager or cold crash, my system acts like a siphon a starts sucking up the liquid in the mason jar. I know there is going to be a density change when I lower the temp, but not this much. The fermentor is sucking up about 2 cups every 2-3 days.
What the heck is happening? And how can I stop it?