Our flock of 19 chickens has lice. We sell the eggs as mostly organic and natural, so I need a lice treatment that is natural and works. I have had good success using soap and vinegar baths; that does kill the lice, but with so many chickens it is time-prohibitive to use that method for the whole flock, especially since it takes ~15 minutes per chicken to do the baths and would need to be repeated every week for several weeks. Do any of you have any success stories to share for natural lice treatments that work? I have read WIDELY varying opinions about using DE as a dust; many people love it (but best I can tell, this is usually as a preventative) but many people also say it does nothing for lice. I need something that will work for a flock that is already infested (as opposed to a preventative). I do not want to use Sevin dust since it is not approved for chickens and I have read that the active ingredient is a carcinogen (which would obviously be a big no-no for our organic eggs). I've read about using Permethrin, but that also seems to be not good for organics. Pyrethrin is supposed to be natural, but I still can't find any info about it's safety on chickens or whether it would be passed to the eggs. Any help would be greatly appreciated!