Wasn't sure what topic to post this under... I just bought my first DE. It isn't foodgrade but it says "Pet Approved Brand". I actually bought it to dust for fleas (yuck!!) in my house. My poor little puppy somehow brought them home from a friend's house . Anyway it says it is safe for indoor and outdoor use including pet bedding. Is this also safe for dusting the coop or do I need to get foodgrade for the chickens because they are more likely to eat it when pecking around? The brand is St. Gabriel and the active ingredients are: Silicon Dioxide....85% Other Element Oxides....10% Moisture....5% Thanks!