![]() How much liquid is left after the mash? More importantly, how much liquid is left after the boil? This will determine your evaporation rate (which can also be affected by your altitude, humidity, the width of your pot, burner temperature, among other things). As you brew, especially when you’re getting started, you need to measure your volumes. Only you can measure the degree to which my system differs from yours. ![]() ![]() ![]() So I need to use more water than a standard stock pot. My system uses a very wide pot that tends to evaporate water ridiculously fast. Every brewer’s setup will be a touch different than the next guy’s. If the final volume is 8% larger than expected, you’ll see an 8% decrease in OG. You need to be accurate with all your measurements. I’d say brewing beer is a lot more like baking, and a lot less like cooking. If in doubt, tell the shop you’re brewing in a bag so they know what you’re working with. Your local homebrew shop should be able to help you mill the grains well. With BIAB brewing, we can err on the side of very fine crushing. Too coarse and you’re well on your way to low OG. This has a huge impact on your brewhouse efficiency (i.e., the amount of sugar you can extract from your grains). In a moment, I’ll walk you through how to fix a low OG, but first, let’s make sure we’re all on the same page on some of the factors that play a role in your OG before you get to the point of having to make corrections: ![]() But that was before I learned how to troubleshoot this oh-so-common problem. After you have dished out all that money on ingredients, this feeling sucks. I should pitch my yeast and hope for the best, knowing I’d end up with a ridiculously low ABV beer at the end of it. For too long, I assumed that if I missed my target OG, that was the end of it. It has happened to me on more than one occasion, and it is beyond frustrating to experience. As all-grain brewers, we have all had this problem eventually. I was inspired to write this guide after a reader wrote in to complain that despite following my recipe to a tee, his original gravity reading came in very low. ![]()
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