At What Temperature Does Rock Salt Stop Working - Web rock salt is used on ice to lower the freezing point of water, usually down to about 15 degrees. One is that the amount of ice that can be melted per pound of salt (or any other deicer). At temperatures lower than this, rock salt becomes less effective and may. But when the temperature is. Web there are two reasons for this.
Web there are two reasons for this. Web rock salt is used on ice to lower the freezing point of water, usually down to about 15 degrees. At temperatures lower than this, rock salt becomes less effective and may. One is that the amount of ice that can be melted per pound of salt (or any other deicer). But when the temperature is.