I'd just use the Permethrin/garden powder. I've never heard anyone say that didn't work. Repeat in 10 days. It's a lot cheaper. I've seen a few people say to treat the chickens, they put some in an old sock and pat it on their chicken, especially under the wings and their butt. Be sure not to let it get airborne so they don't breath it in. Same with DE. DE is a prevention though, Permethrin is for when they got 'em.You have purchased from them? I'm always so warey of purchasing unlabeled chemicals that have been split up from a larger amount... If this treats 30-50, I wouldn't even need that much! This would laste awhile! I have 8 hensthanks for taking the time to help me!