Sometimes the solution enters from the least spectacular door: a kitchen, a discarded seed, a vegetable powder that no one would consider as international award material. Instead three sixteen year old Indians, Vivaan Chhawchharia, Ariana Agarwal and Avyana Mehtathey built their project against them right from there microplastics in water. Is called Plas-Stick and has just won The Earth Prize 2026 for Asia, the international environmental competition aimed at students between 13 and 19 years old. The prize provides $12,500 for the teamto be used to develop and carry forward the idea outside the school laboratory.
The principle is simple to explain, even if it requires tests, dosages and checks behind it: the powder obtained from waste tamarind seeds it is added to water and helps invisible plastic particles clump together into larger clumps. Then those lumps can be separated with a small hand magnet. Microplastics, therefore, disappear from everyday sight in an almost rudimentary way: no huge plants, no electricity, no heavy engineering textbook technology. A powder, a container, a magnet.
A pantry powder
Tamarind is a widely used fruit in South Asian cuisine, with that tart, sweet flavor that makes its way into sauces, chutneys, drinks and popular dishes. Here, however, the interesting part is the seeds, often treated as waste. The group looked right there, into an available raw material, cultivated and also widespread in a spontaneous state in many areas of the Indian subcontinent. For rural communities or schools without advanced filtration systems, this difference matters: an accessible solution is worth much more than a perfect device that no one can buy, repair or power.
Plas-Stick was born with people in mind shared water containersthose used where drinking water is stored and distributed collectively. The project aims to intercept tiny, often invisible particles before they reach the glass. Microplastics measure less than 5 millimeters, with even smaller fragments that easily escape the gaze and the simplest treatment systems. Precisely for this reason the passage from “invisible” to “visible aggregate” becomes the concrete part of the invention.
The choice of magnet adds an almost domestic detail to the scene. The water is stirred for a short time, the plant powder promotes aggregation and then the formed mass can be recalled and removed. It seems like a classroom demonstration, and in part it is. The point, however, is right there: transform a very complicated environmental problem into a replicable gestureat least on paper, in contexts where alternatives are few.
The problem is already in the glass
Microplastic contamination has long since crossed the boundaries of dirty beaches and abandoned bottles. These particles have been found in the air, soil, food and water. Recent studies also report them in human tissues such as the placenta, blood and brain, while the long-term effects on health still remain to be precisely clarified. The research speaks of possible impacts on inflammation, oxidative stress, microbiota, biological barriers and hormonal systems, with many cautions and many questions still open.
The issue becomes even more serious where access to safe water is fragile. According to the latest WHO-UNICEF update, 2.1 billion people the world remains without safely managed drinking water services; among these, 106 million collect water directly from untreated surface sources. In these contexts even a small, cheap and decentralized solution can have enormous value, as long as it is well tested and adapted to real conditions.
And this is where the project of the three Indian students becomes more than a curiosity worthy of a school prize. Their stated goal is to take Plas-Stick beyond early trials, creating small decentralized manufacturing hubs and working in rural communities in India. The idea is to make basic treatment against microplastics more accessible, without requiring complex infrastructures from those who often already struggle to guarantee safe water every day.
However, caution is needed. A tamarind powder, on its own, and does not replace controls, safe water networks, waste reduction and purification systems. Before imagining widespread use, independent tests, analyzes of the quality of the water after treatment, checks on different types of microplastics, residue safety and the ability to function outside of controlled conditions are needed. A good idea remains a good idea even when viewed with caution.
The Earth Prize, which organizes the competition through The Earth Foundation, presents itself as a competition and incubator of environmental ideas for very young people. From 2022 to 2026 it involved over 20 thousand students, more than 6,500 schools and participants from 169 countries and territories. Big numbers, sure. But here the remaining detail is smaller: three teenagers looked at a tamarind seed and saw a way to remove plastic from the water.
The rest will be told by the tests, by the communities that will use it, by the limits that emerge from the official presentations. For now, a simple image remains: a glass of water, a vegetable powder, a magnet in your hand. Plastic, at least for a moment, stops being invisible.
