Originally Posted by kcbrewmeister
This isn't for a specific batch that I am brewing just in general. For instance if mr malty suggests 1 liter starter for a given yeast viability and sg would pitching twice that be beneficial or have negative effects.
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Number 1, you don't "know" your yeast cell count unless you are counting with a microscope + hemocytometer--these are best guess estimates.
So the estimated difference BTW a 1L and 2L starter with month old yeast is about 60M cells (~35% increase)...now tell me, which side of the line do YOU want to err on?
Are you using real oxygen or just shaking your wort--if you are just shaking and coming up with less than the 8 ppm minimum recommended oxygenation, IMO you ABSOLUTELY want to err on the side of more yeast.