3. Temperatures matter! At 30 degrees, one pound of salt melts 40 pounds of ice, while at 20 degrees, one pound of salt melts only10 pounds of ice, a 400% difference! And the air temperature is a minor part of the equation. Does your contractor apply varying amounts of salt to your property at different temperatures? Do the varying amounts show up when they bill for salt, or does it always seem to be “2 tons” every time? Can you afford to be billed 400% more for salt not used?