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I would pay close attention to the temperature at which you took the hydrometer reading. Hot wort can throw off a reading. Also as other posters have suggested, a quick stir before a hydrometer reading can make a huge difference.


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I've had this same thing happen to me before. My pre-boil gravity was one thing and the post boil gravity was actually LESS than the pre-boil. I do all grain and I've found this happens if I take my pre-boil gravity after collecting my wort WITHOUT stirring the wort in the kettle. What happens in my case is that my first runnings sit in the bottom of the ...


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My guess is that you took your gravity readings with a refractometer? Refractometer measurements are very sensitive to extra drops of water that stick around in your pipette or on the refractometer itself. For instance, lets say you pull 4 drops of wort into a pipette that has one drop of water, your reading will be off by 20%! Good practice for gravity ...



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