of Basel took over the majority of shares in 1981, and in 1985 was taken over by the British firm Reckitt & Colman PLC, which ceased production at the site in Salzuflen in 1990. The distribution of Hoffmann's products is done today by Reckitt Benckiser from Slough near London. Education The town has eight primary schools and twenty-three Kindergartens. The districts of Lohfeld and Aspe each have a secondary school, junior high school and high school. In addition, there is the Erich Kästner-Schule, a school for children with learning difficulties. In 2007, the schools in the town had 372 teachers who taught a total of 5614 students, of which 36.5% in primary schools, 13.3% of secondary schools and 21% of secondary schools, 25.3% of high schools, as well as 3, 9% at the special school. Spa and health facilities A remnant of the salt mining, the Gradierwerke had a total length of 424 meters before today's length of about 300 m. Of the original four existing salt works, only two are completely preserved. A third, whose origins date back to the 17th Century, had to be closed due to disrepair. It was rebuilt after a Council decision as Erlebnisgradierwerk and inaugurated again on 28 July 2007 Festival in July 2007. The salt works are now operated only for short cures. The brine trickles down, the air is enriched near the salt works with the salt, the water droplets bind particles in the air. Inhaling salty air moistens the respiratory tract and positively affects the walls of the respiratory organs. In addition, the fine salt crystals have an expectoprant action on secretions, which intensively cleanse the respiratory of bacteria and can reduce swelling of the mucous membranes. Health resort and spa in the city theater, Parkstraße and Wandelhalle (1960–1961) and Konzerthalle (1962–1963) in the park are excellent examples of resort architecture of the 1960s. Kurgastzentrum (1980–1983) designed by the architectural firm Behnisch & Partner. In 1985 it won awards by the Association of German Architects of North Rhine-Westphalia. The Vitalzentrum with the Institute for tinnitus research and treatment. The Vitasol thermal bath is housed under one roof several salt baths with up to 38 °C thermal water from a depth of 1,018 m, and widely integrated into the landscape are a sauna park, health club, beauty and wellness center, a health restaurant, sports and exercise therapy, children's club. The former bathhouses