Snow Shield Purple all natural ice melt is a proprietary formulation consisting of magnesium chloride, agricultural based corrosion inhibitors and sodium chloride. It is a proven Earth friendly formula using anti icing chemicals to create an Earth, kid and pet friendly product which is safer for concrete, brick Pavers and landscaping. Greatly reduces corrosion of metals common when using straight rock salt or calcium chloride. Available: 50lb. bag Effective at: 0°F.