Hi John. Look at the dates of the youtube videos you are watching to see how current they are. FGMO and OA fogging was all the rage several years ago and many of the respected youtube beekeepers recommended them, until everyone realized they did not work very well. Spend the money to buy an Easyvap from johno, similar to the Provap110, or splurge and buy the Provap from snl and treat in a manner that is proven to actually work. There are other treatment options as well but I get the idea that this is how you want to go.
Beesource had an entire forum devoted to FGMO several years ago.
Those that posted, swore that it was the silver bullet.
That forum and those beekeepers are gone.
Dead bees don't enlist much excitement....
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