Most of the salts including sodium chloride or common salt are hydroscopic. They absorb moisture from the air till the relative humidity is higher than smallest value for that salt. They retain some moisture instead of becoming totally dry. Our skin is a semi-permeable membrane, which allows water to go out from the body or to come in the body. While swimming in the salt water, the salt concentration inside your body is lower than that on the outside. This causes our body to eject some water. This increases the moisture in the skin and remains until it is evaporated.
Your skin uses two ingredients for oiling and softening it. They are water and oil that makes your skin more permeable in different ways. The word “moisture” refers to various combinations of these two types of skin components. When you swim vigorously below any water for a long time, it makes your skin dry. Salt water scrubs away the skin oil.
Excessive intake of salt strips the skin of moisture. If you are moderately dehydrated, drink water with a pinch of salt added to it. If you are severely dehydrated, visit a doctor. He will inject saline solution that is simply salt water, in your blood. This will help you recover faster.
Increasing your water intake with a pinch of salt added to it will keep your skin moist. You will not suffer from dry skin, chapped lips and cracked heels. This is the cheapest remedy for dry skin.