At what temperature does pre-wetted salt effectively work?

Pre-wetted salt, which is often used for deicing roadways, becomes effective at temperatures as low as 5°F. This is because pre-wetted salt, typically a mixture of sodium chloride (rock salt) and water, helps to lower the freezing point of water, enabling the salt to work more effectively in preventing ice formation even when temperatures drop.

At temperatures around 5°F, the moisture in the pre-wetted salt aids in the quick dissolution of the salt once it comes into contact with ice or snow, improving its ability to melt ice compared to dry salt. While salt alone is effective at melting ice, the addition of water prevents the salt from becoming too crystallized, which can reduce its efficiency at lower temperatures.

Understanding the effectiveness of pre-wetted salt at specific temperatures is crucial for public works managers who are responsible for maintaining road safety during winter weather. Using salt effectively can significantly improve traction and reduce accidents caused by icy road conditions.