Works best at temperatures of 5 degrees Fahrenheit and above. Diamond Crystal[R] Halite is used to remove snow and ice from sidewalks and parking lots. However, all ice melting agents may contribute to surface scaling of concrete. Use only on properly placed and cured concrete. Do not use on porous or improperly cured concrete, pre-cast, concrete less than one year old. To lessen the possibility of damaging concrete surfaces, promptly remove slush as it is formed. As with any deicer, particular care