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We've seen a good many videos showing how to use a fabric filter to brew in a bag, but there aren't any that detail why this works so well. Here you'll find a bit of science along with some practical information to make great beer in about 3.5 hours using minimal equipment.
We've added a series to YouTube so you can see the step-by-step process of brewing using a fabric filter. This VIDEO outlines the processes and briefly explains the advantages of using true filter instead of relying on the grain bed and a bottom pick up.
I wrote this in response to an article written by Brad Smith in which he stated that one of the "cons" to brew in a bag was a high water to grain ratio. He didn't respond. "You mention that a high WTG ratio produces less beta-amalyse. In my research the higher WTG ratio impacts conversion positively. The enzymatic conversion of starch to maltose for B-Amaylase is activated in the temperature range of 143.6 to 152.6. See the following from Kai Trauser with references to Dr. Ludwig Narziss and Dennis E. Briggs." The results for mash thickness were somewhat surprising....