This winter has proved to be especially troublesome because cold weather requires more salt.
One pound of salt can melt 46.3 pounds of ice when the pavement temperature is 30 degrees, Sproul said.
When the pavement drops to 5 degrees, one pound of salt can melt only a tenth as much - 4.1 pounds of ice.
- jsonline (link here)
This documents why the ice melter has been having a hard time dealing with the ice on my driveway.
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