I had the same thing happen after a half full jug froze in my garage. I shook and shook and then added the solution to my sprayer. (Left the solids in bottom of jug)$!. Then I added another half gallon of water to the jug and did the same thing about 5 more times. In the end, there was a small amount of solids in the bottom that I discarded. Then filled the tank to the prescribed level and sprayed as I always do. It seemed to work fine. Not sure if that was the right thing to do, but I saw no Ill effect and it controlled the FA well.