I've used something similar - called coarse river sand here. Drains well, easy to scoop up poo and the girls can dustbath in it. No flies or smells, it's been brilliant.
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So spring is here and my run smells awful!! About midwinter we had a lot of snow and then it melted, leaving my run one big pond! So I laid down about 10 bags of all purpose sand. That cleared the pond right up, but now that spring is here the ground is completely hard packed and smelly. I looked on here to see what others do and still have no idea what to do with my area. Its 6x10 and I have 8 hens. Should I just lay down more sand or try something else?
My chicks are the same age as yours. Our run was built on top of a vegetable garden. We dug out some soil and added sand. We have a heavy clay soil and I thought we could use the sand/dirt mixture in other gardens or around the berry bushes when we cleaned the run. I think we could be wrong. The chicks have the ground so compacted down that it seems like concrete. They constantly dig around the perimeter leaving ditches that we fill in daily with more dirt or sand. The soil is definitely not the light loamy soil we were hoping for. Hopefully someone will chime in and give some recommendations. I also have pine needles and was thinking of adding some peat moss. I am already overloaded with shavings from the other animals and the coop. I am hoping to get a good mixture of compost for the gardens once a week or so, but the ground is so hard that I can't even rake it even anymore.