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I'd say a starter in an erlenmeyer flask really should be somewhat under filled. As you add more wort, you lose surface area to exchange CO2 and O2. Back when I was doing actual microbiology, growing bacteria, we would only put about ~25% of the stated volume of medium in an erlenmeyer (somewhere around or below the lowest measuring line). Yeast don't grow ...


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I don't think that's unusual. I've had a similar experience where the starter overflowed massively and constantly, creating a huge mess. It didn't happen every time I made a starter, but twice was too much. I don't actually use my Erlenmeyer flask anymore because of this. I may someday buy another 3 liter flask, but in the meantime I've reserved a growler ...


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It is not unusual. I'd easily believe that a 1.5L starter would overfill a 2L erlenmeyer at full krausen. I would suggest using an anti-foam agent in the future. I regularly do 1.6L starters in a 2L erlenmeyer w/o any hesitation or foam-over, due to the introductions of 1-2 drops of liquid simethicone (baby anti-gas drops), available in your local ...



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