09/17/2026
Thank you to Facts They Don’t Teach You for sharing Nithya’s story and highlighting her BioLayer project!
BioLayer began with a simple question: Could natural, affordable materials help reduce lead in drinking water? Nithya developed a prototype using Sphagnum moss and other filtration materials, costing less than $38 to build.
While further independent testing and development are still needed, Nithya’s goal is to make the design accessible to schools and communities that need affordable water solutions.
We’re grateful to see her work reaching more people and inspiring young innovators to use science to solve real-world problems.
Meet Nithya Tammana, an 11-year-old inventor from New Jersey who developed a low-cost water filter using Sphagnum moss.
Her invention, called BioLayer, is designed to reduce lead in drinking water. Action for Nature reports that testing showed the filter could remove up to 95% of lead, with the prototype costing less than $38 to build.
The idea uses the natural ability of moss to bind certain metals, combined with other simple filtration materials.
Nithya has made the design open-source, with the goal of making the technology accessible to schools and communities.
The reported results are promising, but a prototype should not be confused with a certified household water filter. Real-world performance can vary depending on water chemistry, lead concentration, flow rate and other factors, and independent testing would be needed before relying on it for drinking-water safety.
Still, the idea is remarkable: an 11-year-old saw a problem affecting drinking water and explored whether nature could provide part of the solution.