Floating is done in a private float tank containing 10 inches of water and 1000 pounds of magnesium (Epsom) salt. The high concentration of this anti-inflammatory salt allows the body to effortlessly float in the water's surface-relieving joint pressure, allowing the spine and muscles to relax and lengthen, and bringing blood flow to injured areas.Floating is done in a private float tank containing 10 inches of water and 1000 pounds of magnesium (Epsom) salt. The high concentration of this anti-inflammatory salt allows the body to effortlessly float in the water's surface-relieving joint pressure, allowing the spine and muscles to relax and lengthen, and bringing blood flow to injured areas.