Gentle Saline Nasal Rinse System for Children. Salex SSR (Saline Sinus Rinse) offers a 0.72% Isotonic Saline Solution, which is made from Sodium Chloride. It is a High Volume, Low Pressure nasal rinse system used in more severe sinus related cases to “flush” the sinus cavities using a Hydro-dynamic force, clearing excess mucus from the nasal passages and sinuses.