I'll have a small coop and a sandbox of equal size underneath the coop for dustbathing. Size is 5'x4' for both areas. Coop will average 3-6" of wood shavings for litter. Off-hand, can anyone tell me how much DE I should add to both areas? Is a handful too little - a cupful too much? No doubt this question has been asked and answered and I apologize for asking the question, yet again. But, my quick search of the posts on DE turned up WAY more information on the virtues of DE than I ever needed to know. I still came up empty on how much to use. Thanking you in advance for your help.