Remove disks from Disk Pool on MD3220i

Hi there

We recently added 3 new HDD's to our MD3220i and added them to the wrong disk pool via MDSM. We need to remove the disks from the pool to add to a separate disk group.

I've searched all over and haven't been able to find anything on how to do this. Anyone here have experience with this or at least know of a reference that outlines this process?

Thanks!