Cruise Ships: How They Turn Seawater into Drinking Water


Cruise ships are floating cities that require a tremendous amount of water for their passengers and crew. This water can come from a variety of sources, including washing dishes in the ship's kitchens, the ship's laundry facilities, and water used by the cleaning staff to mop floors. But where does all this water come from? The answer is: seawater.

How Cruise Ships Convert Seawater to Drinking Water

Cruise ships are equipped with special pumps in the hull that suck in raw seawater. This water is then transferred to the ship's desalination plant, where it is treated to remove impurities and salt. The desalination process typically involves several steps, including filtration, reverse osmosis, and disinfection.

Once the seawater has been desalinated, it is stored in tanks on the ship. These tanks are responsible for holding and maintaining an adequate supply of water for the various needs of passengers and crew members.

How Much Fresh Water Does a Cruise Ship Hold?

The amount of fresh water that a cruise ship holds can vary depending on the size of the ship and the number of passengers and crew members on board. However, most cruise ships can store around 500,000 gallons of fresh water.

Where Does the Human Waste Go?

Human waste generated on a cruise ship is collected in holding tanks. These tanks are typically located in the lower decks of the ship and are designed to hold large volumes of waste. The waste is then disposed of in port facilities when the ship is docked.


Cruise ships are able to provide their passengers and crew with a constant supply of fresh water thanks to their advanced desalination systems. These systems allow cruise ships to convert seawater into drinking water, which is then stored in tanks on the ship. The waste generated on a cruise ship is disposed of in port facilities when the ship is docked.

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