Kneipp bath crystals Relaxation Pure contain valuable essential oil of Indian balm, as well as the extract of lemon balm. They give you a soothing and relaxing bathing experience. The high proportion of naturally pure thermal brine salt is extracted from pure natural brine in Europe's only remaining pan boiler plant, Saline Luisenhall, which is constantly accumulating at a depth of 460 meters from the salt deposits of a 250 million year old primordial sea. The naturally pure brine is free of chemical additives and environmental influences.