YesI haven't used it.
I *think* I saw where @Molpet has mentioned it before.
A lb of elemental sulfur powder in the dust bath. I also have used a DE applicator poofer in coop, under wings and vent.
Like DE don't breath when applying. I assume chickens in dust bath aren't breathing in dust anyway.
Supposed to be good for resistant mites.
http://entomologytoday.org/2016/07/18/battling-chicken-mites-with-bags-of-brimstone/