Harris SafeMelt (15 lb.) is composed of 100% magnesium chloride that is harvested from the Dead Sea by the natural evaporation of sea water and a simple refinement process. SafeMelt is a deicer that is significantly safer to use and kinder to our environment than most common products. This formula goes to work fast to melt ice on driveways, sidewalks, patios, roadways and more. Moreover, it works at temperatures as low as -13°F (-25°C). Won't burn pets' paws and uses small, pelleted balls instead of jagged crystals to prevent irritation. Kinder on concrete than traditional ice melters. Contains no CMA (calcium magnesium acetate), sodium chloride (rock salt) or calcium chloride.