I live in Michigan about 2 miles from Lake Michigan. I've been purchasing play sand from the home improvement store to use on my poop board under my chickens roost, but I'm wondering if all the free piles of sand along Lake Michigan would be just as good? We can't take sand directly from the beach, but at houses across the street where the wind blows sand people always have signs "Free sand" since it's in their "yards" they can give it away legally. But is this kind of sand ok????