With proper use, the Ayr Saline Nasal Rinse flushes irritants, excess mucus and bacteria from nasal and sinus areas. When clear, the cilia (the hairs that line the nose) provide a natural defense to incoming particles and irritants. The flushing water increases the movement of the cilia that were trapped by thick mucus.By using warm saline, blood flow increases to the nasal and sinus areas and restores the moisture balance. Once clear, the inflamed nasal and sinus tissues can heal and rejuvenate your natural disease fighting and immune systems.