Mountain Organic Natural™ Icemelter is a fertilizer based icemelter. It is made primarily from potassium chloride and its by-products making it the choice of those concerned about the environment. Potassium, a required nutrient to plant life, has long been known as a safe ingredient to melt ice safely. Effective to -23°C (-9°F), Safe on Concrete, Safe on Vegetation and Safe to handle.