I purchased a big bag of DE at TSC. I asked the girl if it was food grade and she said yes it was so i bought it. I have never bought or even seen DE. Is it supposed to be so fine? It looks and feels like ashes. Do I have the right stuff? I hope so, I've already spread it around in the coop and run. I didn't think it would be so fine and airey. Wouldn't it be bad for their lungs? People actually dust their chickens with it? Seems like it would be easily digested. Thank you for your wisdom, in advance!