I thought I was well versed on this matter, but no one can be prepared for an eruption like I had. I've read where this can happen. But not to me! I'm always careful when I take my sanitized dip tube or spoon and give my must a gentle swirl. Especially before and after nutrient additions. But, now I have a new lees stirrer. Yee haw! It worked like a charm when mixing the honey into the must yesterday before pitch and nutrients. But today... Mt. St. Helens!!! Guess I went a little to fast with my drill. Lost a quart or two of my Cherry/Vanilla Melomel before I knew what hit me. Good thing I had no fruit in there yet. You guys should have warned me...