An isolation tank, sensory deprivation tank, float tank, float pod, float cabin, flotation tank, or sensory attenuation tank is a water filled, pitch-black, light-proof, soundproof environment heated to the same temperature as the skin.
An open fiberglass float pool at the Laureate Institute for Brain Research in Tulsa, Oklahoma, USA allows subjects with clinical anxiety to float comfortably, without the apprehension one might encounter in an enclosed float environment.
Example of a float tank using a pod design
Magnesium sulfate or magnesium sulphate is a chemical compound, a salt with the formula MgSO4, consisting of magnesium cations Mg2+ (20.19% by mass) and sulfate anions SO2−4. It is a white crystalline solid, soluble in water but not in ethanol.
Anhydrous magnesium sulfate
Epsomite (Magnesium sulfate heptahydrate)