Stérimar™ Congestion Relief is a hypertonic* solution made from 100% natural sea water, enriched with added copper and magnesium salts to help prevent flu contamination**, wash away even thick mucus and rapidly decongest the nose in case of colds and sinusitis. Stérimar™ Congestion Relief helps to fight colds, sinusitis and limit the risks of secondary infection by washing out nasal cavities with no known side effects from chemicals like steroids or preservatives that some medications may have.