Separation of buttermilk?
All buttermilk separates somewhat. You just cannot see it in the typical opaque packages used for buttermilk. Ours likely separates more because we prefer to not homogenize it so it can be left in the purest state. It easily mixes together when shaken. What sets our buttermilk apart is the low temperature pasteurizing process that we use. Also the fact it is non-homogenized.