After reading so many great things about DE I bought some food grade (fossil flour) and spread it in my coop today while the chickens were out. I'm really worried I did too much or didn't do it right - there weren't many guidelines or posts I could find on how much to do or how often. The air in the coop is making me cough a bit now though so it has me worried. I went and misted the air and bedding with my water bottle sprayer. Concerned about the little guys lungs though they are only 8 weeks old. Here is what I did: stirred up the pine chip litter to fluff it and turn it a bit (deep litter method). Coated it with a good dusting of DE - somewhere around 5-8 cups worth - this is in an 8x11 area. I then raked it into the litter a bit and topped it off with a very thin new layer of litter. Is this safe for people/animals lungs? I did wear a mask applying it but the chickens are going to scratch around and be kicking it up and breathing it and that has me worried as well. Would love to hear from others who use DE and maybe help put my mind at ease.