I have a 6x8x4 covered run that I filled with sand at the beginning of June. After reading many other posts on this forum, I decided to use a couple of inches of gravel & then cover it with 6" of sand. Due to the smaller size of my run, I opted to buy the bags from Home Depot & ended up with play sand. I was in love with my beautiful, CLEAN sand filled run & had visions of scooping the poop with my kitty litter scoop & everyone living happily ever after! Very quickly, my chickens scratched the gravel up through the sand, making it impossible to scoop out the poop without getting a bunch of rocks in the mix or even finding the poop for that matter. Currently, my run looks disgusting. The sand is the color of mud, its hard & packed down (even though my run gets minimal rain because its covered) & when I rake to turn the sand over, it is impossible to find any poo. How often do you change your sand out?? I'm going to start over again...does anyone have suggestions for what I can do better/different this time??