Anywhere from 500 tons to 3000 tons depending on conditions. We are trying to reduce salt usage where possible, not only because of its high cost but for ecological reasons. It damages trees and runs off into our streams. Incidentally, when the temperature drops below 20 degrees, salt becomes less and less effective. It is dormant at zero or below and does little or no good. We are now using Dow Armor, a liquid product that is mixed with salt and has the potential to work faster and stay on the roads longer. Also, Dow Armor is environmentally friendly.