By Eric Elwell, Storm Center 7 Chief Meteorologist
There are several different types of salt that contain additives to help melt snow and ice.
Different additives can increase the effectiveness in frigid weather.
Standard rock salt is effective down to about 20 degrees.
Potassium chloride can work down to about 12 degrees, with magnesium chloride working down to about 5 degrees.
When temperatures reach extreme levels, calcium chloride can be used, which has an effectiveness down to minus 25 degrees.
In climates where temperatures get even lower, hot sand is most commonly used.
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