Melting Speed: Activar® speeds the conversion of dry ice melting salts to a liquid brine, this process results in faster melting action and a safer surface in less time. When you need to get to a safe surface fast, Triple Melt® with Activar® can get you there & save you money along the way. Sub-zero melting,15% calcium/magnesium chloride agglomerate. Safer for concrete and vegetation. Anti-caking agent.