IceAway 25 lb. De-Icing Salt. It contains primary sodium chloride rock salt and is economical. This salt melts effectively to 5 degrees Fahrenheit, making it ideal for de-icing walkways and driveways. When used as directed, it is safe on air-entrained, cold weather concrete that is at least one year old. Use 1 cup (10 ounces) of ice melt per square yard and spread evenly, avoiding piling or overspreading. Remove resulting slush. Reapply ice melt as needed.