Does anyone out there know if crushed egg shells would work like DE for insect control? In gardening, they help control slugs the same way DE is advertised, by physically damaging the insect with the hard, sharpish surface. I give my chickens their shells, after drying and crushing, for the calcium. For fly problems, I can't imagine either helping much, since fly larvae (maggots---ughhh!) live in manure and yukky stuff rather than in the soil, where the DE is suggested to be used. Maybe a fan in the chicken house would help discourage flies and dry it out so their larvae can't thrive? We've had a monsoon season for weeks here in central Oklahoma and the flies love the chicken house.