A team of researchers has created a small, portable water filter that could make it much easier for people to get clean drinking water during natural disasters and in places where safe water is hard to find.
The device is inexpensive, lightweight and screws onto ordinary plastic water or soft drink bottles, making it easy to carry and use almost anywhere.
The invention comes at a time when climate change is putting increasing pressure on water supplies around the world.
More frequent floods can contaminate wells and rivers with harmful bacteria and chemicals, while droughts can leave communities relying on polluted water sources.
According to the United Nations, water-related disasters such as floods and droughts now account for most natural disasters worldwide.
Despite improvements in water access, UNICEF and the World Health Organization estimate that more than 2 billion people still did not have safely managed drinking water in 2024.
The new filter was developed by researchers from the Sri Lanka Institute of Nanotechnology, Newcastle University and Monash University Malaysia. The team received a Sri Lankan patent for the invention on December 31, 2025.
The project originally focused on solving a serious health problem in Sri Lanka. In some rural areas, groundwater contains harmful heavy metals, which have been linked to chronic kidney disease affecting local communities.
However, the researchers soon realized that the same technology could help people facing many other water problems around the world.
The filter works as a small attachment that fits onto a standard plastic bottle. After filling the bottle with water, users simply squeeze the bottle to push the water through the filter. No electricity or complicated equipment is needed.
Inside the filter are two different filtering materials. The first layer is made from very fine nanofibers that trap bacteria, viruses and heavy metals. The second layer contains modified activated carbon, which helps remove chemicals, unpleasant tastes and smells, while also improving protection against harmful microbes.
Tests described in the patent showed promising results. The filter removed up to 99.999% of common bacteria, including Escherichia coli and Staphylococcus aureus.
It also reduced levels of several dangerous heavy metals, including lead, cadmium, chromium, iron and arsenic. In one groundwater test, the filter removed almost all of the cadmium and about 69% of the arsenic.
The prototype weighs less than 10 grams, filters water at a rate of about 100 milliliters per minute and can treat up to around 1,300 liters of water before needing replacement.
The research team is now looking for companies, investors and humanitarian organizations to help bring the technology into large-scale production. They believe the filter could be useful not only for rural communities but also for emergency relief, refugee camps, disaster response teams, schools and people living in regions regularly affected by floods or droughts.
Although further testing and manufacturing work is still needed before the product becomes widely available, the patented design offers a promising new way to provide safe drinking water when people need it most.
In a world facing growing climate challenges, a simple filter that fits onto an everyday bottle could become an important tool for protecting health and improving community resilience.
