here in central louisiana, it is difficult to find the origional recipe 7 dust. i was told by the older farmers that it was taken off the market and changed. I went to an older feed and seed store that has been around for a while, and found some cans of the origional. I also use diatomaceous earth. to apply, i spent the 11.00 and bought an applicator for "dusting". I decided since i use 7 dust in my garden and have several coops and quite a bit of chickens, it would be worth the money. the applicator has a small canister at the bottom, and a tube that looks like a cheap childs water gun on top, and u just pump it back and forth and is spreads a fine dust over the area.