We just found round worms in some chicken feces in the coop. We have two coops that are cleaned twice a day. 44 chickens share the coops. The chickens also free range. Ages from 6 months to two years. We feed DE daily and ACV in water. I have been searching all day for a safe wormer to use that will be safe for egg layers not meat birds. Called the mfg. of Wazine and even that product is not labeled for egg layers. The mfg. said we could do a 17 day period before eating the eggs but the product is not FDA approved for this. Wondering what if anything others have used. Flubenvet? Safeguard? Any suggestions? The DE clearly does not work. We are very disappointed as we have tried our best to stay away from chemicals. Thank you for any help.