I've used it before, but really only on those that were struggling. I put just a teensy drop in with every other watering while they were recovering. I lost a few but saved quite a few with that method. When I haven't used it I've generally lost all those I've tried to save (as in those that were given to me by those who didn't know how to care for them).
I'd have to say it seems to work, at least that was what I attributed y recovery rate of Phals from a few years ago. Beyond that, I don't have personal experience. I do keep it around though just in case and probably should have been using it during the extreme drought and heat war we had for several months. Oops, forgot it was there, lol...
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