I was going to stick some oat husks in my next order to see if I could improve the recirculation flow in my BIAB set up whilst still allowing me to crush my grain very finely. On the Homebrew Company website I noticed that it said to "wash well before use". This struck me as an odd thing to have to do for grain husks. Any idea why this might be and what might happen if I don't? Is it about cleaning them, or does rinsing change they way that they behave in the mash?