Okay, I am confused about this DE stuff. I read alot of BYC banter over this. I think I am good with using it....but I bought some today and the guy at the feed store said it was feed grade NOT food grade. He said it was fine to go into their food. Can I give this to the chickens? Will it kill bugs? Is it good to use for the deep litter method? Also read on here that water makes DE inactive...then how is suppose to help with worms or how is good for humans (speaking of just the food grade here) having water in the saliva? Thanks!