What is the process for adding DE to the run? Just sprinkle it on the droppings? How often? Do it with the chickens in the run or while they are in the coop? I have read that DE in the run will keep the odor down and dry out the droppings, I'm just not sure how to use it. We do use it in the coop, I sprinkle it on the areas that have the most droppings.