Sorry, don't have a pic available. The optimum size can vary a bit depending on your grains. Some grains are a bit plumper than others. What you are looking for is to make sure all the husks are cracked. Pick up a small handful and check to make sure they are all cracked. The more of them that are cracked but still intact, the better your grain bed filtration. For most of your base grains a mill gap in the .040 to .044 area works well. Some like to go tighter to squeeze more efficiency out of the grain.
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