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Sugar doesn't kill microbes. Microbes don't grow in it because there's little water around. But if you have an open bag of sugar (or anything for that matter) sitting around in your kitchen that you dip into every morning for your coffee, there are microbes getting into the bag. So the boiling does indeed sanitize the solution. Secondary to that the ...


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It's because sugar dissolves much more easily into boiling water, and the syrup that results is easier to incorporate evenly into the beer. There's a sanitizing component as well, but it's minimal.



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