Putting some salt in the foot bath helps to increase the osmotic pressure in the water and also has a certain cleansing and sterilizing effect. It is good for the skin of the foot, and can play a role in improving minor skin inflammation. It is recommended not to put too much, so as not to have too high osmotic pressure. After adding salt, the concentration of about 0.9% can be close to the physiological state of the human body, there is no irritation to the human foot skin. Soak your feet in hot salt water, you can also promote local blood circulation, help relieve fatigue and promote the operation of qi and blood.