I have a feed bin(metal trash can) & I noticed last week that there was bugs in the feed & in the bin. Luckily there wasn't much feed in the bin & I had to go to the grain store for some more. So Yesterday I cleaned out the bin of any leftover bags/feed & noticed that there was an abundant number of bugs in the bottom of the can. So I figured I would try a little experiment to see how quick DE works. So I dumped in a cup full of DE, put the lid back on & figured I'd have dead bugs by morning. Nope, the bugs are just walking on top of the DE like there is nothing there!! The DE I have is the consistency of flour, the DE I have bought in the past was a different consistency. That wouldn't make a difference, would it?? I really thought that the DE would have killed the bugs, but I guess I was wrong. It is food grade & says CODEX on the bag. What can I use to kill the bugs in their feed bin?? I wouldn't want to use chemicals since their food is kept in it. Any suggestions???