Steps to follow: Fill a bucket or basin with warm water. After adding 1/2 cup of Epsom salt to the water, stir well. Place your feet in the basin and soak them there for a few minutes (about 5-7 minutes). After removing your shoes, wash your feet with warm water and wrap your feet in a towel, blanket, etc. How it works: When Epsom salt dissolves in water, it produces magnesium and sulfate. Magnesium is believed to relieve muscle spasms and calm the nerves. So, when you soak your feet in this foot bath, the soothing ingredients that relieve back pain are absorbed into the skin.