Quote:
Originally Posted by StrictlyIPAs
so here's the ultimate newb question: Once you have stasis with your hydro, it's time to bottle.
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Not necessarily. For several reasons, some yeasts may stop fermenting before the final gravity is reached. Factors such as too cool a ferment, too little oxygen, too little nutrients are just a few of things that could go wrong. However, the rule that you are ready to bottle after the specific gravity has remained the same for a period of time is generally true assuming that the ferment went 'well'.
All other things equal, the original gravity of the wort, the fermentability of the wort (you can increase gravity of a wort using unfermentables) and the expected attenuation of the brand of yeast are the primary contributing factors in how low your final gravity will go.
The formula for calculating attenuation is to divide the number of points the gravity dropped by the original gravity points. So if your original gravity was 1.050 and your latest reading is 1.016 then:
1.050 - 1.016 = 0.034
Then just take the big whole numbers (34) and divide by (50) times 100 for 68% attenuation.
You then compare that percentage to the percentage expected attenuation for the yeast (you have to look it up on the manufacturers website).