My homemade vaporizers worked great. I made 2, so one could be cooling, while I treated another hive. They are just half inch copper pipe (like the ones posted on the internet), administered through a hole in the back of my SBB or Slat Rack (which I keep corked when not treating). They seem to be worst on my strongest hive, but hopefully I can knock them back. I did not treat 2 of my hives that were mid-summer splits, seem strong and are full of honey, so I will be curious if there will be any correlation to which ones survive (if any :?).