Hi Ewan - my theory on that was that you would therefore get the most out of the fine half of the extraction [first] and then it would rush down through the courser grind second [since it was at the bottom] adding an element of under-extraction... my thinking was that it's better to have the fine at the bottom to keep it extracting that little bit longer in the [courser] top half... Of course at the end of the day, it's whatever works for you, but that was my theory! A
