Gallery: Eliodomestico: Solar Terracotta Water Filter Distills 5 Liters...

These devices can be built anywhere from readily available materials.

Diamanti’s solar powered water filter is designed to provide drinking water for families in developing countries. Eliodomestico is a solar still that operates a bit like an upside-down coffee maker. At the beginning of the day, water is poured into the terracotta chamber. As the day begins the still heats up and eventually gets hot enough to boil the water, creating steam. The steam forced into the expansion nozzle at the top and then condenses against the lid, where it then drips down into the catch basin below. At the end of the day, assuming it was hot enough outside, there will be 5 liters of fresh drinking water available.

The solar-powered filter can function without fuel, electricity, filters, and it requires no maintenance. These devices can also be built anywhere from readily available materials – anyone who can throw a pot can handcraft the main elements necessary for the water filter. Diamanti estimates that a normal solar still costs around $100 dollars and only produces about 3 liters a day, while his Eliodomestico could be made for $50 and produce 5 liters. The design is available as an open-source project for anyone who wants to make one and is licensed under a CC Attribution-NonCommercial-ShareAlike 2.0 Generic License.

+ Gabriele Diamanti

Via Designboom


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  1. Jean Baptiste Bizimana August 11, 2014 at 4:50 am

    Good. How can I get a sample?

  2. Jean Baptiste Bizimana August 11, 2014 at 4:47 am

    This project is so much interesting. It contributes to relieve several people’s lives. I would like to ask if this project can be tested in filtering also ordinary river water. Because in my country people still use river or lake water to drink.

  3. ksrabbani January 22, 2014 at 11:27 pm

    I find it very difficult to believe that a device with such a small exposure area (to sun) can produce 5 litres a day. From the pictures, the area seem to be about 0.12 sqm. At the typical tropical solar radiation levels (1000 watts/sqm), the solar power falling within this area will be about 120 watts. Because of heat losses the net power gained will be much less than this. Even if we target an ambition 50% at temperatures needed for boiling the power comes down to 60 Watts.

    An Australian device recently marketed has a total exposure area of about 3 sqm and it produces about 20 litres of distilled water in a whole day. Therefore, 5 litres expected from 24 times less area seems to be superambitious. Is there any scientific publication which shows real data from this device?

  4. sheldobal December 30, 2013 at 7:54 pm

    Where can I buy an Eliodomestico solar water distiller?

  5. Wainani December 29, 2013 at 5:34 pm

    I would like to make my own Eliodomestico solar household distiller. How do I get the plans?

  6. delprete10 October 23, 2013 at 9:33 pm

    Where can you buy the solar water filter?

  7. Neha Gupta July 15, 2013 at 9:36 am

    Wow this is awesome! How does one make it?

  8. Naveen Narayan July 10, 2013 at 11:01 am

    Where can we find more information to build this in my village
    in India there are 10000 above people don’t have accessibility to only
    sea wter and they have to sometime travel and wait for hours to get a
    pot of drinking water everyday . people don’t take bath months because there
    is no wantter but in effect around plenty of seawater which they don
    know how to make it to drinking water please help

  9. Masonjar April 21, 2013 at 5:49 am

    Where does one find the blue prints as to how to make?
    Thank you

  10. apurva99 October 8, 2012 at 3:53 am

    hey dis project is d best 1, i liked it.. can u mail me more details about this topic on my email id, i want learn more about it.. thanks..

  11. Brokenseal September 11, 2012 at 12:08 am

    I would love to buy the Eliodomestico to show my friends as we live 35mile off the coast of Texas and we have have had a few Hurricanes.I dont like being without water found this out the hard way during Ike.

  12. mitra December 11, 2011 at 9:52 pm

    Nice idea, but lets do the numbers.

    So $50 cost of production, means $200 to the end consumer. A typical developing country family uses 15 liters of drinking water per day. (3 liters * 5 people). So they need three of these – total cost $600.

    This is at least an order of magnitude too expensive to solve the problem.


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