Paul, you make an excellent point. About a month ago I racked several diff carboys, adding sorbate to one in need. While I did use water, sorbate doesn't seem to mix with water very well. I figured it was good enough, so tossed it in. Later that sorbated wine developed weird patchy floating spots. Fearing Flowers of Wine, I reracked leaving the top couple inches behind and doubled up on the kmeta. I filled those carboys to the absolute max as research told me that this infection needs oxygen to live, so no available oxygen will kill it fairly quickly. At this point that wine is sitting quietly with no reappearance of floaties. I don't know for sure what it was, but I know for sure I will mix sorbate a LOT more thoroughly than I did last time as I did NOT enjoy that stress.
Pam in cinti