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Sorry, but even coarse sand is way too fine to serve as grit. What is sold as poultry grit is composed of granite chips which have rough, irregular edges, perfect for what chickens need grit to accomplish for them. Sometimes road bed sand will have gravel mixed into it and there may be some gravel bits that are rough enough and suitablly sized, but honestly, poultry grit is really cheap and a five pound bag lasts forever. Why not just buy some poultry grit and then you know your chickens will be getting what they need?
I used bagged, all purpose sand for my runs. In my opinion, play sand is too fine textured.