I've been reading about DE and searching the forums on this topic but I'm still confused. I've been having a terrible fly problem around the coop. I clean the inside of the coop every morning and the run and "sandbox" every afternoon. Since the chickies free range a lot of the day, I walk around the yard every day and pick up that poop too. I also put some fly bags in the trees around the coop. It's still awful. I was hoping that DE might help but I am confused on the following things: 1. I ordered 50 lbs of food grade DE from the feed store. As long as it says "food grade" will that be ok? Is there anything else I need to read on the label to know its safe? 2. Do I just sprinkle it around on the grass in the run and mix it into the sand in the bottom of the coop and the dustbath area? How much do I use? 3. Do I put it on the chickens too? They are just 7ish weeks old - are they too young? 4. Can I sprinkle it around the whole yard since the chickens free range? If I do that, will it be safe for the kids to run around in the grass? Sorry for all the questions. New to DE and want to do it right. Thanks so much!!