Why is it recommended for those working in hot shops to drink salted water?

In hot shops, the air temperature is much higher than room temperature, and therefore a person begins to sweat intensely. Then water and substances dissolved in it, for example, mineral salts, come out. Due to heavy sweating, a person loses a lot of water and electrolytes (sodium, potassium, chlorine, etc.), which can cause various unpleasant consequences. Salted water replenishes fluid and electrolytes, while salts help retain fluid in the body.