I used playground sand that I bought from Lowes & I will NEVER do this again. Admittedly, I made some mistakes...after reading many threads on the topic, I opted for pea gravel under my sand. This was a huge mistake I didn't put enough sand down over the gravel & my chickens quickly kicked the gravel up through the sand, making it a rocky mess & almost impossible to scoop, without getting a bunch of rocks.
What I don't like about the playground sand is that it gets tamped down & becomes hard, like a rock. Eventually it gets to the point where you can't rake it because its so hard & packed.
In the spring, I plan on digging my entire run out & starting over, this time with a coarse, construction grade sand