I just wanted to add a comment about two different types of sand & how they might work better or worse depending on your climate.
Contractor's sand still has some clay in the sand mixture, so it works well for landscapers to fill between rocks & pavers for pathways. It holds shape better.
Play sand has been washed & strained more times, so the clay has been gotten out & the particles are finer.
Play sand will drain better if your in a wetter environment --like I am, in the North East or the Pacific North West.
Contractor's sand will work better to not blow away in the wind if you're in a dry & windy environment, like the South West.
Poops scoop from the play sand better, because you're not taking clumped clay along with it.
Play sand smells better after rain.
I've had to redo my entire run with play sand, because the contractor's sand would get a funky anaerobic bacterial layer after two days of rain.
It stinks (like a lake shore when you dig) and I've had two chickens get sick from it. The run gets minimal sun to dry it out & is in a valley.
Play sand may do this too, I haven't gotten to test it yet. Doubt it, though.