How to Make Sea Water Into Drinking Water

Make fresh drinking water from salty sea water.
••• water image by Ross Young from

Making sea water into drinking water requires removal of the dissolved salt that, according to the U.S. Geological Survey, makes up approximately 35,000 parts per million (ppm) of sea water's chemical composition. Removing the salt from sea water, or desalination, on a large scale is extremely expensive, but creating enough pure water from sea water for personal use is surprisingly cheap and easy, and turns on the sun's power to evaporate and purify water.

    Find a small piece of land that gets full sun exposure and dig and use a shovel to dig a hole approximately two feet deep by three feet across.

    Line the hole with a plastic tarp.

    Place a heavy cup or bowl at the bottom center bottom of the hole and fill the hole around the cup/bowl with sea water, making sure the sea water does not rise higher than the top of the cup/bowl.

    Cover the hole with a plastic tarp and secure it to the ground around the hole with rocks, then place a small rock in the center of the tarp directly over the cup/bowl.

    Wait for the sun to evaporate the sea water. The sun evaporates the sea water, and fresh water creates condensate on the underside of the top tarp, which runs along the plastic down to where the small rock creates a dip over the cup/bowl. The fresh, condensed water drips into the cup/bowl at the top tarp's lowest point, i.e., at the point where the small rock makes the tarp dip toward the collection cup/bowl.

    After several hours remove the top tarp, then remove the collection cup/bowl from the center of the hole along with the fresh drinking water inside.

    Things You'll Need

    • Small piece of land
    • shovel
    • Two plastic tarpes
    • Cup/bowl
    • Four medium sized rocks
    • One small rock
    • Sea water

Related Articles

How to Convert Salt Water into Freshwater (Drinking...
How to Make Sea Water Drinkable
How to Build a Small Still
How to Get White Film off Sea Glass
How do I Make a Model Waterfall for Kids?
How to Boil Sea Water to Drink
How to Reduce PH in Water
Uses of Rain Water
How to Make a Water Filter Using Sand & Rocks
How to Make Crystals With Bluing
How to Build a Dam for a School Project
How to Fill a Water Barometer or Storm Glass
Middle School Science Fair Projects With Dry Ice
How to Create a Small Windmill for a Science Fair Project
How to Make a Wind Turbine With Soda Cans
Kids' Density Experiments With Salt, Water & Eggs
How to Cut a Geode
How to Make Glowing Water for a Science Fair Project
Advantages & Disadvantages of Constructing Dams
How to Build a Submarine for a Kids Science Project