Even normal seawater has toxic concentrations of salt: “seawater's sodium concentration is above the kidney's maximum concentrating ability. Eventually the blo

Even normal seawater has toxic concentrations of salt: “seawater's sodium concentration is above the kidney's maximum concentrating ability. Eventually the blood's sodium concentration rises to toxic levels, removing water from cells and interfering with nerve conduction, ultimately producing a fatal seizure and cardiac arrhythmia.” https://en.wikipedia.org/wiki/Salt_poisoning https://en.wikipedia.org/wiki/Salt_poisoning