Quick Answer
It takes around 2-4 hours to collect 1 liter of water using a solar still, depending on the sun's intensity and the efficiency of the still. In ideal conditions, with direct sunlight and a well-designed still, you can expect to collect water at a rate of 0.5-1 liter per hour. This slow rate makes it essential to plan water collection carefully.
Designing an Effective Solar Still
A well-designed solar still can increase the efficiency of water collection. To create a simple still, you’ll need a shallow container, a clear plastic sheet, and a wick or sponge to draw water up from the collection area. The still should be positioned at a slight incline to allow water to flow towards the center, where the collection area is located. This design helps to concentrate the sun’s heat and increase the rate of evaporation.
Building a Solar Still
To build a solar still, start by digging a shallow hole and placing a container in it. Next, lay a clear plastic sheet over the container, securing it with rocks or weights. Place a wick or sponge in the center of the still, and surround it with soil or sand. As the sun heats the plastic, water will evaporate and condense on the underside of the sheet, dripping down into the collection area. This technique allows you to harvest clean water from even the most contaminated sources.
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