There are about 600 kilograms of Epsom salt in a float tank, and like any form of salt, it can sting a freshly waxed or shaven body. However, Epsom salts can be used to heal skin conditions like psoriasis; the first 7-10 mins may sting; we provide single-use packets of petroleum jelly that act as a liquid bandage, ask at reception before you start your float session.