The MadiDrop: An Affordable, Easy-to-Use Water Purification Tablet


MadiDrop Access to potable water is a severe and increasingly pressing issue for countries in the Global South. Due to a confluence of factors including overuse, population growth and climate change, an estimated two-thirds of the world’s population will be living in water-stressed areas by 2025. One recent innovation that could potentially revolutionize water purification in poor, rural communities is the MadiDrop.

The MadiDrop is a porous ceramic disc that has been infused with silver or copper. When dropped in water, the tablet releases ionic silver or copper that strips away bacteria and pathogens to produce clean, drinkable water. Each tablet is capable of treating 10 to 20 litres of water for up to six months. The result is an affordable, easily distributable and long-lasting alternative for families who lack access to a safe, potable water source.

PureMadi water filtersThe MadiDrop is the second water treatment technology developed by PureMadi, an organization formed by a group of interdisciplinary students from the University of Virginia. Their first project was the creation of a ceramic water filter factory in South Africa. The filters use local labour, readily available materials (clay, sawdust and water) and are treated with a dilute solution of silver nano-particles that effectively filter out common waterborne pathogens. The PureMadi ceramic filters were designed to create a cheap and sustainable point-of-use water purification solution for low-income households. To date, they have been well-received and highly effective among families in Limpopo province, South Africa.

The impetus for the MadiDrop was to apply this successful model to create an even cheaper point-of-use water treatment technology. The MadiDrop can be used in a variety of water storage containers, and at only a few dollars per drop, can provide families with purified water for an extended period of time. Lab results look promising but extensive field testing is still required to determine whether the MadiDrop is a sustainable and culturally appropriate solution. With any luck, the MadiDrop will eventually be widely used to improve clean water access and curb the spread of waterborne diseases in low-income communities.

To learn more PureMadi’s water purification filters and tablets, click here.


Courtney Mollenhauer

Courtney Mollenhauer

Courtney is a writer and development professional based in Toronto, Canada.


  1. please inform how one can get it for his house hold use in rural india
    can it be purchased by post /vpp

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