Pollinosan Nasal Spray, an exclusive formula created by Dr. Alfred Vogel, starts to work instantly — provides maximum effectiveness. Bottle cap uniquely constructed to Beneficial Effects a back flow of solution into the reservoir after spraying. Result: You never have to worry about polluting the spray in the bottle. It’s Pollution Proof – something you won’t find in other sprays. Pollinosan Nasal Spray does not contain the preservatives found in other sprays that may damage sensitive nasal cilia – a benefit worth thinking about. Unique! The Pollinosan bottle is self-sterilizing. During the spraying, the solution is actually sterilized by the specially silver-coated nozzle.