The document describes a solar still designed by Cástor Rodríguez and Pablo Lete to purify water. It consists of a plastic bottle with a concave glass covering part of the bottle to intensify sunlight, aluminum foil to retain heat, and a funnel to collect purified water. The solar still purifies water through evaporation and condensation caused by the intensified sunlight. It has advantages of being easy to make from materials that may be available in emergencies and is lightweight, but has the disadvantage of purifying water slowly due to its small size.

1. Pure Water
By: Cástor Rodríguez and Pablo Lete

2. Not all persons can have water
Nowadays we have a problem. Not all people can
have water.

3. Forms of helping
They are a lot of forms of helping nowadays, it
can be by affording and give the money to
associations or going to help.

4. Our form of helping
But we´ve done a solar still for purifying water.

5. How it works
Sun rays go into the still through a concave
glass for amplifying them

6. How it works
A few rays escape thanks of the
aluminium, that being a metal
remains hot.
Water
evaporates
Condensates
And falls
into the
container
Solar rays get
stronger after
passing through
the concave glass

7. How we made it
Water container
Water falls in
the funnel

8. This is the container
and the support
How we made it

9. This is the support with the
funnel
How we made it

10. We covered the other part of
the bottle with aluminium foil
A concave glass intensifies
sun rays
We´ve used a magnifying
glass
How we made it
A plastic with a
heavy object helps
the water to fall into
the funnel

11. Advantages of our project
• If you are in a desert island, unfortunately, you can get bottles from the sea for
do these solar still.
• These project is easy to do, doing it lasted us for 17 minutes.
• Isn´t very heavy

12. Disadvantages
• Is so small that it only purifies 2mL/h, so if we get more quality materials, it
would work faster.