I just got my order of food grade DE. It says to add 2%. to the dry weight of the feed? What does that mean? I buy 50lbs bags of feed. I have 2 feeders. 1 is 3lbs and the other is 1 lb feeder. So how much should I add. Math was not my strong subject in school. Also my chickens are 6 weeks old and the turkeys are 8 weeks. Is this to young to start adding the DE? For the bedding just sprinkle it like salt or cover the top then mix in? Sorry about all the questions just trying to get it all right. Thanks for any advice.