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American Focus > Blog > Tech and Science > Deep-Sea Desalination Pulls Fresh Water from the Depths
Tech and Science

Deep-Sea Desalination Pulls Fresh Water from the Depths

Last updated: August 12, 2025 1:15 am
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Water scarcity is a pressing issue that is affecting cities all around the world, from Cape Town to Tehran to Lima to Phoenix. With the United Nations forecasting a significant gap between water demand and supply in the next five years, companies are turning to innovative solutions to address this growing problem. One such solution that is gaining traction is subsea desalination, a technology that extracts salt from water deep in the ocean.

Traditionally, desalination processes have been energy-intensive and costly. Methods like boiling seawater or using multistage flash distillation have been used in the past, but they require a large amount of energy. Reverse osmosis, which uses high pressure to push seawater through a membrane, is more efficient but still energy-intensive. Subsea desalination, on the other hand, harnesses the natural pressure found hundreds of meters underwater to separate water from salt, significantly reducing energy consumption.

Companies like Flocean, based in Oslo, are at the forefront of subsea desalination technology. By utilizing existing membrane and filter technology in combination with subsea pumps, Flocean has been able to achieve a 40 to 50 percent reduction in energy usage compared to traditional desalination plants. The deep sea environment also offers advantages such as fewer microorganisms, stable temperatures, and less need for chemical pretreatment of water.

Despite its potential benefits, subsea desalination still faces challenges in terms of cost and scalability. The technology needs to become more affordable and efficient to compete with traditional water sources. Additionally, concerns about the impact on marine ecosystems and the logistical challenges of implementing subsea desalination in coastal cities need to be addressed.

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However, companies like Waterise and OceanWell are already making strides in bringing subsea desalination to commercial scale. With projects underway in locations like the Red Sea and off the coast of Norway, these companies are working towards providing a sustainable solution to water scarcity. Long-term government contracts and support will be crucial for the widespread adoption of subsea desalination.

While there are still hurdles to overcome, experts believe that subsea desalination has the potential to revolutionize the way we obtain potable water. With advancements in technology and a concerted effort to address environmental concerns, subsea desalination could become a viable solution for cities facing water shortages. It may take time to reach true city-scale implementation, but the future looks promising for this innovative technology.

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