The water is less than a foot deep, but has so much Epsom salt dissolved in it that it’s more dense than the Dead Sea — each tank contains 800 to 1000 lbs of Epsom salt to provide buoyancy! You float effortlessly. The tank is kept warm, body temperature, and it’s enclosed so it’s completely dark and quiet. It’s your own private world. It’s utterly relaxing. The lid may be closed or left open, you’re in control. The simple act of floating in warm salty water is the most relaxing experience on Earth.