Snow Joe MELT50CC Melt Calcium Chloride Crystals Ice Melter Resealable Bag, 50-Pound Generates heat instantly upon contact with snow and ice-Melts down to -25 degrees Fahrenheit Convenient Resealable bag for easy storage and extended shelf life Safe on sidewalks (when used as directed)-Lasts up to 24 hours for long lasting traction control Will not harm grass, wood, concrete, metals, or other vegetation when used as directed Never use any ice melt products on freshly poured concrete that has not had adequate time to cure