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Offline Appalachian Alchemist  
#1 Posted : Tuesday, November 12, 2013 4:51:13 AM(UTC)
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I am fermenting a thin mash recipe of 8lbs. flaked corn, 1.5lbs. two-row, and 16lbs. cane sugar in 10 gals of water with 1 packet of whisky pure yeast. The s.g. when I started was 1.070 and almost two weeks later it is still bubbling and is only down to 1.030. The temp has maintained between 70-74 the whole time. I realized that it was going to take longer than the 72-96 hrs (according to Ian Smiley's book), but I did not expect to be this long. Should I let it ferment all the way down to 1.0 or less as long as I still see it bubbling? Should I have used 2 packets of yeast? It still smells sweet so I am not worried of bad mold yet but it seems to have taken a lot longer than I expected and am starting to doubt myself whether to let it go or run it. Any thoughts or suggestions would be appreaciated. Thanks.
Offline RCRed  
#2 Posted : Tuesday, November 12, 2013 6:18:26 AM(UTC)
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Howdy

That temp of 74f is rather cool and will extend ferment time. It can take two-weeks plus - I've seen that on my sweet feeds here when missus has another bout of hot flashes and turns the house into a meat locker... I don't mind, it means less off flavors. I'd check it again in a day or so and see what trend you have on the sugar consumption (FG).

Had that been me, I woulda pitched more yeast, but I'm of the school of doubles - I use a single pack of Prestige Whiskey(23grams) for 5gaL, then 2 for a 10 and so on... What was the size of that yeast packet? - 23grams, or?
Offline johnnyapplepie  
#3 Posted : Tuesday, November 12, 2013 7:22:04 AM(UTC)
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I agree with RCRed, the cooler temp will make the ferment time take longer. I've had them go as long as 20 plus days. To be honest If it's still bubbling just be patient and let it finish. You can't rush perfection.
Offline John Barleycorn  
#4 Posted : Tuesday, November 12, 2013 8:15:58 AM(UTC)
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"Hi AA,

I agree with Red and Johnny. Just let it finish. I think you'll find that a slower, cooler fermentation will give you better results.

Every yeast is a bit different. They all have slightly different ideal fermentation temperature ranges. I always try to keep the temps in the lower half of the range and never push the gravity. BTW: your OG measurement looks spot-on given the amount of sugar you used.

From now until somewhere around the middle of June most of my fermentations will be taking place in a room that never gets above 68 F. But that's never been a problem. Some of my rice washes have taken three or more weeks, but they always end up clean and clear. And I've never had an infection ... just keep the lid on and the airlock in place.

BTW: If your airlock doesn't look like it's going to blow off, or if the lees are already nice and compact and the wash looks crystal clear, it doesn't mean the yeast aren't still working. The beer guys know this ... especially when they're bottle conditioning/carbonating in units of months rather than weeks.

Just relax, sip on some spirits, and let nature do its thing. When it's finished you'll know you didn't add off flavors because you rushed things.

Regards,
--JB"
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