Specially designed nozzle delivers the finest and most gentle mist for adults, children and infants. Helps alleviate: nasal allergies, dryness, post nasal drip, congestion and stuffiness from common cold and flu. Advantages of Hypertonic: Some research shows that hypertonic (2.7%) or more concentrated solution may help reduce nasal congestion better than isotonic (0.9%) solution. The theory is that hypertonic or higher concentrated salt solution will draw the water out of congested tissue, reduce the edema or swelling and open up the nasal passages and sinus openings to allow for better drainage. It is possible you may experience temporary burning or stinging, in which case please use our isotonic spray.