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They say it’s not really desalinating seawater in the traditional sense, but rather harvesting fresh water from devices that function like wells in the ocean.

While desalination facilities are abundant in countries like Israel, Australia, and Saudi Arabia where water scarcity is acute, the energy required to desalinate water at scale presents a significant environmental hurdle.

Polhemus said the costs for purifying wastewater will probably be about half the costs of desalinating ocean water.

India is among many countries that have built huge plants to desalinate sea water.

The south Asian nation, now the most populous in the world, is among many countries that have built huge plants to desalinate sea water.