Teen student creates water filter that removes 95.5% of microplastics
An 18-year-old student from Virginia, Mia Heller, has attracted attention with a filtration system that removes microplastics from drinking water. The development has received recognition in scientific circles.
Microplastics in drinking water are a rising concern across the United States. These tiny particles can cross the blood, brain barrier and are linked with chronic inflammation, oxidative stress and a higher chance of neurodegenerative diseases such as Alzheimer’s and Parkinson’s. Mia decided to tackle the problem after she noticed the lack of funding for state-level filtration initiatives in the United States. Her family’s experience with the regular upkeep of conventional water filters, including the frequent replacement of filter membranes, prompted her to look for a simpler, cheaper alternative.
A homegrown solution with a twist
Mia built the first prototype of her filtration system in 2025, working in her parents’ garage in Virginia. The device uses a magnetic fluid that binds to microplastic particles, allowing their removal with a magnet. This avoids the need for a fine membrane, reducing both cost and maintenance.
The device is about the size of a typical household appliance and is designed for domestic use. The magnetic fluid is largely reusable, which further reduces running costs.
Awards and recognition
Mia’s project drew attention. In 2025 she was a finalist at the Regeneron International Science and Engineering Fair (Regeneron ISEF), one of the world’s largest student competitions. She also received a special prize of £400.00 from the Patent and Trademark Office Society, an organisation that supports innovation. She has also received multiple other awards for her work.
What this could mean
Beyond offering a potentially more affordable and lower-maintenance alternative to conventional filters, Mia’s system achieved a purification efficiency of roughly 95.5% with its magnetic-fluid approach.
Removing microplastics is both a health and an environmental concern. As Mia told the Smithsonian, “That inspired me to design a filter without membranes, in order to reduce the cost and maintenance effort of water filtration.” Avoiding traditional membranes reduces cost and maintenance, addressing barriers many households face.
Her invention could have applications beyond her local area. With state-funded filtration programmes in the USA remaining under-resourced, solutions like Mia’s may help expand access to cleaner water.
Mia Heller’s project is an example of what young people can contribute to environmental problems and the practical challenges of water purification.