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Old 12-14-2012, 03:43 PM   #1
kylebenton
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Default Overflowing Starter

I made 1800 ml of wort at 1.040 in my 2 liter flask, pitched a vial of WLP001 and placed it on my stir plate. It was covered loosely with sanitized aluminum foil. After about 24 hours I came home to find that it was foaming over and making a mess. I make starters all the time and have never had this happen. Is this going to be a problem, and how should I avoid this in the future? I am thinking I may need a larger flask for starters of this size.


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Old 12-14-2012, 03:52 PM   #2
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Two things:
- don't make a first step starter greater than about 1.25L in a 2L flask without fermcap. I often go to 1.8L on second step starters in a 2L flask with 4 drops fermcap. It still foams though, so it requires monitoring but is doable.
- your yeast kicks ass. Salvage what is left and make a new starter if you can.


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Old 12-14-2012, 03:56 PM   #3
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It's happened to me with WY3068 - that thing was a monster! And yes, a larger flask will help with the mess in the future.
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Old 12-14-2012, 04:02 PM   #4
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Fermcap, wax paper over stir plate
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Old 12-14-2012, 04:30 PM   #5
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Thanks for the info, I'll have to get some fermcap. I usually make 1200ml starters, I made this one larger because I wanted to harvest some of the yeast before I pitched.
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Old 12-14-2012, 04:35 PM   #6
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I make 1.5L starters and use a sanitized foam stopper.
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Old 12-14-2012, 05:15 PM   #7
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If you don't use fermcap, just be mindful of the yeast being used and give it enough room to work. I made the mistake of making a 2.5L starter of 3787 in a 3L flask on a stir plate. NEVER DO THAT!
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Old 12-14-2012, 06:05 PM   #8
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LOL pep talking them to not blow off DOES NOT WORK EITHER
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Old 12-14-2012, 06:09 PM   #9
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Once was enough for me. Now I only fill my starter vessel about half way.
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Old 12-14-2012, 06:12 PM   #10
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So I'm confused. I have not had any appreciable foam on a starter because, I assume, the stirring action keeps the bubbles knocked down. But I only have made a 1 liter starter so far; does this effect change as the flask gets more full?

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