Was wondering if the play sand that you get at Lowes is ok for the chickens. I want to do half of the coop in sand and the other half use the deep litter system. Is this ok or should I just stick to the shavings in the coop. I purchased a 40 pound bag of DE and have used this in the coop and run, as well as new shavings. I know some sand that they sell has silicone in them.