DE will not keep Northern Fowl mite off your birds. They are nasty little red specs of what look like red pepper bugs, that can suck the life out of a bird in a hurry. I use Permethrin liquid and dust. After 50+ years with birds, I use what works.DragonLady have you ever used DE on your flock?i added a cat litter pan to my orps coopi put sand in the pan & some DEi figured when they take a dust bath they will get a little of the DE on them which should keepany bugs from thinking my orps would be a good home.we also add a drop or 2 ACV in their 5 gallons of drinking wateri got tired of dirty water so i added a bucket with 4 nipples & a lid that has a hinge in the middle for easy filling. piglett