To begin with I must say I am addicted to this forum. I have learned sooo many things from the different threads and had a few chuckles as well(ya'll crack me up). I researched all I could on food grade de and got great info from many on you. My main reason to purchase was to keep down the flies with with my 5 pekin ducks (5 ducks=lots of poop=lots of flies). I found custom millings to be cheapest(no luck at local feed stores) and they delivered in 2 days UPS from Ga. I live in the central east coast of florida on 2 acres of sand ridge and we have a terrible time with noseeums. After using it in my coops and in the runs I thought I would test it by our 2 steel buidings my dh works out of. I am happy to report that it has cut down the population of these pesky guys drastically and people who normally apply spray when coming "out to the back" of our house have said they were not getting bit up at all. Many thanks to all of you I hope this helps someone else.