The first compressed air barriers were laid back in 1967. At that time, mainly nitric acid, phosphoric acid, and sulfuric acid, intermediate products for the production of nitrophoska, an artificial fertilizer, were produced. If these chemicals get into the water in the event of damage, they can cause great damage. A compressed air barrier creates a horizontal flow in 2 directions. Floating substances on the water surface cannot overcome the barrier. Over the years, the plant and with it the compressed air barriers have been constantly expanded. A total of 4 individual barriers currently have a total length of approx – 2,500 m.