Obviously, it's important to make sure it's not too coarse and not too fine. What is the best grind? This last bag my wife had done seems to clog up very badly.
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I've had the best luck with the standard grind for a flat bottom drip coffee system. I don't know the actual size of the grind, but it's basically the common size you would gind in something like 8 o' clock.

Hope that helps (or makes sense...:-))
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