Floatation therapy or sensory deprivation therapy is a chance for you to completely shut out from the outside world. It is based on silencing of all senses, neuro-relaxation that astronauts use in zero gravity.
Floatation tank is filled with water that keeps you constantly on the surface due to high Epsom salt (MgSO4) concentration. While you're floating, all outside influences on your body and soul are eliminated: sound, light, smell, tactile senses, gravity. The end result is deep mind and body relaxation without feeling for space and time which has positive effects on your overall health.
Short-term sessions of sensory deprivation are described as relaxing and conducive to meditation.
Lower stress level and blood pressure, detoxification, injury healing, better focus, releasing from chronic pain - these are just some of the benefits that floatation therapy provides.