RE: [Distillers] Re: Questions from a newbie?
- Yes I did aerate the wash but it is really good to know all that attention to detail really is important. Alot of it I do just by gut feeling and years of helping my parents with their wine making and a bit of brewing but plan to make 2010 a year of learning brewing in more depth. I have been a voyeur of this site for quite a few years but have been missing a bit of basic knowledge in hindsight. Thanks all for your feedback (most of it non judgemental) and very helpful. Cheers, juliet
Date: Wed, 13 Jan 2010 15:08:11 +0000
Subject: [Distillers] Re: Questions from a newbie?
I assume you are using the Alcotec Gold Turbo Super yeast which will ferment 6kg of sugar in 3 days for a 25 liter wash. This is the advertized numbers and will produce a wash of 14.1%ABV. The first thought that comes to mind is that since you added another 2kg over the recommended quantity this would produce an 18.8% ABV wash. Just guessing here, but that high a gravity wash may have caused way too much osmodic pressure on the yeast and killed them off. 18.8% is high even by S. Bayanus standards, and usually the sugar is added in steps to reach this level. This may explain why they start off fermenting fine and then stop. I know for a fact that beer yeast only have a tolerance of 14% ABV and 18% is way over the limit. Since turbo yeast has the nutrients in it, I dont believe thats a problem.
Some other thoughs are did you aerate you wash and also the question of the pH as was mentioned before. A properly aerated wash is necessary for yeast growth - read the posting I just made in New Distillers http://groups. yahoo.com/ group/new_ distillers/ message/37653
pH is important since yeast grow best between a pH of 4 and 6. To quote Dr. MB Raines:
pH. The last factor to affect yeast growth is pH (a measure of acidity). Yeast grow well at acidic pHs. They grow best between pH 4 to pH 6. Normal wort is acidic with a pH near 5.2. During growth and fermentation the pH drops to about 4.1-4.2 and in some cases even lower.
One last thought is check the expiration date if there is one on the yeast package. What I would do now is to remove about 1/3 of the wash (8 liters or so) and add water to bring the SG back to 1.110 (25.8 brix) for a 14% ABV wash again. Since its been sitting for so long, aerate with a pump and stone for 6 hours or so and re-pitch another pack of turbo yeast.
And next time Juliet, please follow the directions when using a new product or procedure... .. .
Vino es Veritas,
Jim aka Waldo.
--- In Distillers@yahoogro ups.com, juliet kent <julietyumyum@ ...> wrote:
> OK. I used more sugar than usual, 8 kg instead of 6kg, i used a different yeast called turbo gold super yeast compound. I have measured sg of water (1%), brew (now at 14), sg of initial mix (8/25) (13) and alcohol reading still below zero but I can taste a small level of alcohol but it still very sweet.
> I threw in a second lot of yeast (small amount and it worked away like crazy) but still no improvement in alcohol content so Ahem I threw in a beer yeast because it was all I had and I am miles from town and thought it couldnt hurt and it worked away for another week but still no change. More nutrient required?
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