I just got D.E. about a mth ago and Ialready see results. Less flys, no external bugs. I give it to my chickens in there feed and they have been expelling the worms. I got it froma guy in Lake Elsinor. He sells it. Wolf creek ranch. I got a 50lb sack. He does ship to. But I went and picked it up. You can look up his website, it is very informative. Plus, if you have any questions call him. He has been using it on his rescue wolves for a long time. Good luck~ Tacey