Safe Step 4300, 50 LB, Dual Blend Ice Melter, Contains Sodium Chloride & Magnesium Chloride, Formulated With Powerful Ice Breaking Minerals To Quickly Penetrate & Melt Ice Effectively Down To -7 Degrees Fahrenheit, Safe For Air Entrained Cold Weather Concrete That Is At Least 1 Year Old When Used As Directed, Poly Bag.