Safe Step Extreme 7300, 8 LB, Calcium Chloride Ice Melter, Melts Ice & Snow Down To -25 Degree Fahrenheit, Instantly Generates Heat, Starts Melting Immediately, Penetrates Ice More Deeply, Safe When Used As Directed On Air Entrained Cold Weather Concrete That Is At Least 1 Year Old, Won"t Leave Powdery Residue, Jug.