

1-my coop has a sand floor, which is great! When I do a complete clean out, what do those of you using sand do with the old sand? Is it reusable, or do you just chuck it?
2-The primary reason I used sand was because I think it helps to keep flies from gathering, seems to, anyway. But I kind of want to seed the adjacent daytime run with grass to give them a free range feel. How can I reduce flies in this case?