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Why can't we use sea water as drinking water?

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Even with all of the water in Earth's oceans, we satisfy less than half a percent of human water needs with desalinated water.* We currently use on the order of 960 cubic miles (4,000 cubic kilometers) of freshwater a year, and overall there's enough water to go around. There is increasing regional scarcity, though. read more

Sea water makes up 97.3% of the Earth’s water, so only 2.7% is fresh water. Drinking sea water can be deadly to humans.our kidneys are the filters that separate the waste material in the blood and this waste is then stored in the form of urine in the bladder, ready to be expulsed from the body. Sea water contains 3% of salt. read more

Seawater is toxic because your body fails eventually when it has to try to get rid of the salt that comes from sea water. Your body normally gets rid of excess salt by having the kidneys produce urine, but it needs freshwater to dilute the salt in your body for the kidneys to work properly. read more

One of the instruments scientists can use to measure salinity is a CTD rosette, which measures the Conductivity (salinity), Temperature, and Depth of the water column. Seawater contains salt. When humans drink seawater, their cells are thus taking in water and salt. read more

Encyclopedia Research

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Can we drink Seawater? - YouTube
Source: youtube.com

Further Research

Can humans drink seawater?
oceanservice.noaa.gov