nate42
January 25, 2013, 3:07pm
#1
So, I have one of those aquarium pump based systems for aerating my beer. I know now that its probably no more effective than a mix stir, but I’ve already got it so I use it.

Anyway, has anyone ever tried running a system like this continuously while their starter ferments? Would this be a reasonable alternative to a stir plate? Just curious.

There is actually an option for this in the Mr. Malty calculator.

http://www.mrmalty.com/calc/calc.html
Below is the amount of yeast growen with a fresh smack pack in a 2 liter starter using the different methods.

Simple Starter - 200 Billion
Simpler Starter With O2 @ Start - 225 Billion - 12% more then simple starter
Intermittent Shaking - 255 Billion - 27% more then simple starter
Continuous Aeration - 270 Billion - 35% more then simple starter
Stir Plate - 305 Billion - 52% more then simple starter

nate42
January 25, 2013, 4:01pm
#3
I use Mr. Malty all the time, you’d think I would have noticed this. Thanks Greg.

So, would Continuous Aeration lead to faster fermentation? is that what i’m getting out of this? what’s the 35% represent?

No, it means the yeast have better access to the nutrients they need to reproduce, and you end up with 35% more yeast in your starter.

No, it means the yeast have better access to the nutrients they need to reproduce, and you end up with 35% more yeast in your starter.[/quote]

Gotcha, Thanks.