Polar Express, 50 LB, Ice Melt, Time Release Blend Of Calcium Chloride In Flake, Potassium Chloride In Granular & Sodium Chloride In Crystal, Safety Max Formula Allows Product To Melt At Lower Temperatures, Safer For The Environment, Contains Heat Generating Ice Control Crystals That Ensure Performance At Lower Temperatures, Works Effectively In Temperatures Down To -15°ree. Fahrenheit, Poly Bag.