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I suppose I should ask what it is that generally leads to the volcano.

What stops volcanoes is before adding anything to a young wine do a gentle small stir to release gas.

Another thing that helps is to dissolve the additive in a small amount of water before adding to the carboy. This eliminates (for soluble things) or reduces (for not-quite-soluble things) the nucleation sites.
 
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
 
Have not had a problem adding sorbate or K-meta, as I usually add when I'm racking so there is usually lots of headspace. Thought about another hydrometer when I was at store, passed, but I think I will get a spare when I pick up my juice tomorrow. Cheap price compared to the distance I would have to drive if I do break my original. Knock on wood, it's been about 6 years since I started.
 

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