If it were me, I’d use the gallon jug and start with two and a half quarts until it finished, crash it and decant, let the yeast warm to about the temperature of your second addition of one to one and half quarts of wort and let it finish. You should have enough yeast cells if not more than enough. jmo… but I’m no expert at starters either.
I love the MrMalty calculator, but doing two-stage starters with it can be frustrating.
One simple alternative is to use the Wyeast calculator (http://www.wyeastlab.com/hb_pitchrate.cfm). It does have some limitations: works only in gallons, no adjustment for viability, and gives results as pitching rate rather than cell count, without allowing for decanting the starter.
BTW: I’m assuming you can’t get a stir bar to turn in your gallon jug, so I’m using “intermittent shaking”.
Anyway, here’s how to spoof MrMalty:
Set your production date, then play with the gravity and/or volume fields to get the volume of your first stage (I’ll use 1 L).
Note the number of cells that grows (178B).
Turn off the automatic viability calculation and enter that number for the viability.
Enter your real gravity and volume, and the calculator will tell you the volume of the second stage (2.24 L).
Verify that the volumes are realistic and adjust the first-stage volume if needed. Ideally, you want to at least double the volume at each step.
When making the starter(s), be sure to allow enough time to chill and decant at each stage before stepping up.
3.6 liter is just about 1 gallon. I don’t think filling the jug to the top would work well. I imagine everything overflowing.
Yes, I can use a stir plate with the 1 gallon jug. I gave a 1 inch stir bar. I have only tried about 1/2 gallon of water but it works fine. 25 ohm rheostat and two 10 ohm resitors in series later I can control it well.
So using the method described by a10t2. Start with a 1L starter, and then refridgerate, decant, and step to a 1.06L starter.
IMHO you’re splitting hairs with the 1 gallon jug. I’d rather use the 1 gallon jug with maybe an ever so slightly richer wort filled to the taper than to go through the hassle of a double starter that may or may not give you a higher cell count.
Yeah, in that case I would just go with 3 L or 3.5 L, whatever you can fit in the jug. I think that’s a better option than assuming you’ll get substantial growth from two same-size stages. None of us can tell you how many cells you’re actually pitching anyway.
OK, the 3L starter has been on the stirplate for ~36 hours. Very little krausening, a few patches of foam, very thin skim across the top for awhile.
Is this the excpeted result? Krausening is the reason I didn’t want to put the 3.5-3.6L starter in. Clearly it would have been perfectly exceptable with the lack of krausening.
Starter is made of briess light Pilsen DME. Approx a 1.040 starter wort
Nice, I’ve had my eye on one of them for awhile but haven’t pulled the trigger yet. That’s a little cheaper than the one they have on Amazon. Guess I’ll have to compare the shipping cost when I decide to buy one.
