To start the melting process, salt grains absorb water needed to take effect.  

It becomes active after a certain time (20 to 30 minutes for slightly negative temperature range).

Meanwhile:

- Black ice or snow remains on the road surface in spite of the appearance of safety given by spreader.

- A part of the salt spread is dispersed by road traffic.

Furthermore, from 7 to 8 degrees below 0°c, free water level is too low to initiate properly the melting process. With such temperatures, the effect of salt is stopped.
 

To avoid these drawbacks, a method consists in dissolving salt and spreading it directly in the form of brine.

The salt dissolved in this way takes effect immediately but the brine spread is going to dilute rapidly with water coming from ice melting or treated snow and air moisture. Thus, its effect is limited over time.


 Wet salt consists in humidifying salt grains before spreading it on the road surface. This method combines the advantages of the two previous processes and removes their drawbacks:

 

- Brine has an immediate effect on the film of snow or ice.

- As brine dilutes, salt grains progressively melts extending its effectiveness.

- Thanks to water provision, the solution remains effective up to ambient temperatures from 10 degrees below 0 to 12 degrees below 0.

In addition, brine improves salt grains adherence on the road surface and limits salt evacuation caused by road traffic.

Thus, it will be possible to reduce salt grains dosage and cut spreading costs for the same effectiveness.

Another substantial advantage is that the use of brine permits saving 30% of dry salt which extends the distance covered before reloading.

 

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