It's definately safe. You just have to wash it for hours, I know I did. It looks great, and really natural, I have just two gripes about Play Sand:
The grain sizes are soo different (from pebbles to fine grain sand) that I find it very hard to vaccuum it. I can't tell what's waste and what's just the sand, so alot of sand always get sucked up since I think it is waste.
It takes forever to clean before you put it into the tank.
Aside from those two negatives, it's great. My fish love it.