Oh, I don't worry too much about freshness of crushed grain - it seems to hold up pretty well. The separation takes place pretty quickly. If you are using whole bags, then no problem. If you are using partial bags, then you might want to give the bag a good shake to make it more homogenous before you pour out the portion you want for that day.
I suspect the same issue happens with whole hops - you can end up with more lupulin in the bottom of the bag and less at the top.




