Peat mixed in run with dry leaves from fall is enough and probably cheaper. Peat is also more effective than other products at breaking down ammonia which can get to toxic levels especially during the winter when chickens may spend more time in doors. If want sand, it clearly states ok for pets on bag so think ok but this does not replace the need for poultry grit. Sand tends to be cooler in the winter. Adding leaves or straw may add more warmth.