How to Clean Water with Sunlight

It is often advised by doctors to drink purified water to avoid germs that can enter the body via water intake. A normal person may think that purifying water will be quite a process that involves a lot of time as well as special equipment. Quite surprisingly, it is very simple to purify water by just exposing it to sunlight. If you are a middle school student who is looking for ideas on science projects then this idea can be a truly useful one. This will not only earn you good marks, but will also prove to be an important source of information for many others. In order to conduct this experiment of purifying water, you need to have the below mentioned equipment readily available.

Things Needed:

– Broad plastic basin
– Collecting jar for purified water
– Transparent plastic sheet
– String or rubber band for holding the plastic sheet
– Stone or weight
– Table Salt


  • 1

    Setting up the apparatus

    Fill a plastic bowl with tap water and mix some salt into it. Place a collecting jar inside the basin right in the middle, ensuring that the basin's water is not above the height of this collecting jar.

  • 2

    Covering the basin

    Cover the top of  the basin with a plastic sheet and seal the edges by a string or rubber band, ensuring it is secured tightly at the edges. After covering, place some weight or stone over the plastic sheet in a way that it is exactly on top of the collecting jar.

  • 3

    Placing in the Sun

    Place the basin carefully into the sun for some time and observe what happens next. After a few hours, it will be noticed that some water has collected in the collecting jar.

  • 4

    Taste the Water

    Take the collecting jar out of the basin and taste the water. You will notice that it is absolutely pure and there is no salt in it. This is because when water evaporates, it leaves all impurities behind and the sunlight provides a natural way for water evaporation.

  • 5

    Impurities are left behind

    Keeping the collecting jar in the basin for some more time will have more water in the collecting jar, thus leaving all the impurities behind.

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