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Old 12-13-2010, 03:26 PM   #1
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Default How to Tell When Active Fermentation is Over?

What are the signs of active fermentation being over; when the krausen drops, or?

Typically, the 'beer' could potential push CO2 for weeks. How do you know when the active fermentation stops?


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Old 12-13-2010, 03:29 PM   #2
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hydrometer readings are consecutive for 3 days. I like to wait 3 weeks though since it helps clarity.


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Old 12-13-2010, 03:34 PM   #3
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hydrometer readings are consecutive for 3 days. I like to wait 3 weeks though since it helps clarity.
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Old 12-13-2010, 03:37 PM   #4
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Old 12-13-2010, 03:40 PM   #5
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What about the absense of krausen? Does that indicate that active fermentation is over?
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Old 12-13-2010, 03:43 PM   #6
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What about the absense of krausen? Does that indicate that active fermentation is over?
The amount of krausen can vary for whatever reason, it can come quick and depart quickly or it can linger long after fermentation is complete, and it all be normal.

For example, I had a wit beer that I pitched bottle harvested Hoegaarden yeast on Dec. 26th, that STILL had a 2" krausen on it three weeks later. I took a grav reading and it had reached terminal gravity, 1.010. So the beer was done, but the krausen still lingered. I finally gently swirled the beer to knock it down, and let it settle for another week before I bottled it. I'm not normally a fan of knocking them down, and usually let it do it naturally.

But some yeasts are low flocculating, and may have a difficult time. I figured since mine was bottle harvested, and I had pitched the starter at high krausen, maybe it was "genetically mutated" with the flocculation "gene" off or something. So I gently swirled it and let it fall.

I brewed another batch with another mason jars worth of that yeast several months later and had the same thing happen.

Beligan wits are notoriously long krausening.

So it goes back to the fact that the only reliable guide to how your fermentation is going is.........


Like I said here in my blog, which I encourage you to read, Think evaluation before action you sure as HELL wouldn't want a doctor to start cutting on you unless he used the proper diagnostic instuments like x-rays first, right? You wouldn't want him to just take a look in your eyes briefly and say "I'm cutting into your chest first thing in the morning." You would want them to use the right diagnostic tools before the slice and dice, right? You'd cry malpractice, I would hope, if they didn't say they were sending you for an MRI and other things before going in....

Thinking about "doing anything" like repitching, or bottling, or racking, without first taking a hydrometer reading is tantamount to the doctor deciding to cut you open without running any diagnostic tests....Taking one look at you and saying, "Yeah I'm going in." You would really want the doctor to use all means to properly diagnose what's going on?


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