Water is being sold by the pharmaceutical experts, from the murky English Channel to Americans as a blocked nose remedy.
Drugs company Shering-Plough claims that its Afrin PureSea Hydrating Nasal Rinse is "the only nasal rinse product made of 100 per cent purified seawater."
The water is sourced from one of the world's busiest shipping lane several kilometers off the coast of Saint Malo in northern France, which is surrounded by sewage works.
But the company still says that it has been proven to clear mucus, and help people breathe more easily.
French company Goeman, which extracts the water, told the Mail that the water is collected several kilometers off the coast for purity, and has to meet strict quality controls.
The water will not be marketed in the UK, reports the Telegraph.