Kneipp balancing mineral bath salt is made with valuable natural essential oil the high content of pure and natural thermal spring salt is sourced from europe s last remaining salt works saline luisenhall mined by using traditional pan boiling methods which reveal unique salt crystals free from chemical additives and environmental pollutants these salt crystals are evaporated from the pure waters of a 250 million year old underground salt water sea the salt s unique crystal form is easily