Quick Answer
A solar still can be effective for water collection, especially in hot and dry environments. It's a simple, low-tech method that requires minimal materials. When set up correctly, a solar still can produce up to 1 liter of water per hour.
Setting Up a Solar Still
To set up a solar still, you’ll need a container or hole in the ground, a clear plastic sheet, a rock or container to weigh down the plastic, and a container to collect the water. Dig a hole about 1-2 meters deep and 1-2 meters wide. Place the container or hole in the center of the depression. Cover the hole with a clear plastic sheet, weighing it down with a rock or container in the center.
Using the Solar Still
Place a small container or cup in the center of the plastic sheet. Add a few rocks or sand to the center of the plastic sheet to create a depression. Place a small amount of water, about 1-2 cups, in the depression. Seal the edges of the plastic sheet around the container or hole with soil or rocks. As the sun heats the plastic, water will evaporate and condense on the underside of the plastic. The condensed water will drip into the container or cup.
Maximizing Solar Still Efficiency
To maximize the efficiency of your solar still, choose a location that receives direct sunlight for most of the day. Avoid setting up the still in areas with dense vegetation or near bodies of water. Use a clear plastic sheet that’s at least 1-2 millimeters thick to allow for maximum sunlight penetration. Consider using a solar still with a built-in condensation system, such as a small tube or channel, to collect and direct the condensed water into a container.
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