Teenage Student Invents Water Filter That Removes 96% of Microplastics

A teenage student in the United States has developed a home water filtration system that can remove nearly 96 percent of microplastics, offering a low-waste alternative to traditional household filters.

Mia Heller, an 18-year-old student from Virginia, came up with the idea after learning that everyday drinking water contains tiny plastic particles that researchers increasingly suspect may be linked to health risks in both humans and animals.

According to reports, Heller began thinking seriously about the issue several years ago when she realized that households were often left to deal with the problem on their own. That concern became more personal after her family installed a home filtration system and she saw how difficult and expensive it was to maintain, especially because its membrane filter needed frequent replacement.

That experience pushed her to look for a simpler and more practical solution.

Heller started building a prototype in her garage in early 2025. The result was a filtration unit roughly the size of a standard home appliance that removes about 95.5 percent of microplastics from water, a performance level that puts it in competition with many existing filtering methods.

Instead of relying on a solid membrane, her system uses ferrofluid, a magnetic liquid that attaches to microplastic particles as water moves through the device. A magnet then pulls those contaminants out, leaving cleaner water behind. Most of the ferrofluid can also be recovered and reused, which could help reduce both waste and long-term operating costs.

Heller has described the project as an affordable and lower-maintenance option for home use, particularly for families looking for a practical under-sink filtration system.

Her prototype earned her a place as a finalist at the 2025 Regeneron International Science and Engineering Fair, one of the world’s leading science competitions for high school students.

While she hopes to eventually commercialize the idea, Heller has acknowledged that scaling the technology may be difficult for now because ferrofluid remains expensive to produce in large quantities.