Salt water foot soaks can be an aid in eliminating leg swelling, but you need to pay attention to the dosage. The common causes of lower extremity edema are cardiogenic edema, nephrogenic edema and angioedema. No matter which cause of edema, foot soaking in salt water is of some help. The specific use is warm water and salt mixed into a three percent concentration of salt water, slightly higher than the osmotic pressure of cells in the body. And then need to pay attention to the time when soaking feet, to about half an hour is appropriate. After soaking, you need to dry the water in time. To summarize, foot soaking in salt water can help eliminate the swelling of the legs. If there is any discomfort, you need to go to the hospital in time.