Evan!
Well-Known Member
Last Friday, I brewed my first Lager (and second AG brew), a Pilsner. OG was 1.055, about 73% efficiency. Good so far. I pitched a large (1000mL) starter of Wyeast Bohemian Lager yeast and aerated fully. Here's where my inexperience with lagers comes in...
From all I've read and heard, lagers take like 4 weeks to finish fermenting. And about the time it's done, you raise the temp up for a diacetyl rest. Okay. So here's what I did: I pitched the starter, aerated, and waited at 60f for signs of visible fermentation. As soon as I saw airlock bubbles and krausen, I moved the carboy to the lagerator and dropped the temps to the low 50's. Fermentation was pretty steady for a few days.
Here we are at day 5. I figured this would be a long slow process, but it looks like it's done. The krausen has fallen and airlock activity has slowed considerably...maybe a bubble every 15-20 secs.
So, what's the deal? First off, if lagers are bottom-fermenting, why was there a krausen? I didn't expect that. Second, why did it ferment so quickly? Or is it probably not done? Is there some kind of "initial fermentation phase" where it's quick, and then 3 weeks of very slow fermentation? When should I do the diacetyl rest? Also, since the top stays closed (obviously) on my lagerator (chest freezer), when I open it up, the blast of CO2 hits me in the face and knocks me back a few feet. Strong shyte. Is all this cooped-up CO2 a problem for the beer?
Of course, the only way to know whet the deal is, is to take a hydro reading, but I wanted to get your thoughts on it before I bothered popping the stopper out. Thanks in advance.
From all I've read and heard, lagers take like 4 weeks to finish fermenting. And about the time it's done, you raise the temp up for a diacetyl rest. Okay. So here's what I did: I pitched the starter, aerated, and waited at 60f for signs of visible fermentation. As soon as I saw airlock bubbles and krausen, I moved the carboy to the lagerator and dropped the temps to the low 50's. Fermentation was pretty steady for a few days.
Here we are at day 5. I figured this would be a long slow process, but it looks like it's done. The krausen has fallen and airlock activity has slowed considerably...maybe a bubble every 15-20 secs.
So, what's the deal? First off, if lagers are bottom-fermenting, why was there a krausen? I didn't expect that. Second, why did it ferment so quickly? Or is it probably not done? Is there some kind of "initial fermentation phase" where it's quick, and then 3 weeks of very slow fermentation? When should I do the diacetyl rest? Also, since the top stays closed (obviously) on my lagerator (chest freezer), when I open it up, the blast of CO2 hits me in the face and knocks me back a few feet. Strong shyte. Is all this cooped-up CO2 a problem for the beer?
Of course, the only way to know whet the deal is, is to take a hydro reading, but I wanted to get your thoughts on it before I bothered popping the stopper out. Thanks in advance.