1. Made of USP grade sodium chloride and sodium bicarbonate, mixed with 0.9% aqueous solution, the purity is over 99%, close to the concentration of human body fluid, suitable for all kinds of people 2. Deep cleaning of the sinuses and pharynx, which can help relieve The following symptoms: Fluid reflux, sinus pressure, and choked Sensitivity, dryness and pollen allergy Nostril discomfort caused by different irritants 3. No preservatives 4. Made in USA