Kneipp Mineral Bath Salts contain hand-processed, natural thermal spring salt sourced from a 250-million-year-old ocean buried 1500 ft below the Earth’s surface. The ancient thermal brine is free of chemical additives and environmental influences, producing salt in its purest form, uncontaminated by the pollutants of the modern world. The high concentration of trace elements and minerals that naturally occur in our deep-sea salt gently cleanses and softens the skin as you relax in the tub.