A High School Student Just Built a Water Filter That Removes 96% of Microplastics, Without Expensive Equipment

A high school student in Virginia has built a filtration system that removes more than 95 percent of microplastics from drinking water. Her approach uses a magnetic liquid, ferrofluid, to pull tiny plastic particles out of the flow, without relying on traditional filter membranes.

The idea comes at a time when microplastics are turning up almost everywhere scientists look. From oceans to human organs, their spread is raising concerns, even if the full health impact is still being studied.

In Warrington, Virginia, water contamination made the issue hard to ignore. Local reports pointed to the presence of PFAS and microplastics, leaving residents to handle filtration on their own. That situation pushed Mia Heller, a student at Kettle Run High School, to start experimenting with a different kind of solution.

A Home Problem That Turned Into a Working Prototype

Mia Heller didn’t start in a lab, but in her own house. As explained by Smithsonian Magazine, her family had installed a filtration system that worked, but needed constant maintenance, with filters that had to be replaced again and again. That routine became the starting point for her project. She wanted something simpler, with fewer parts to swap out.

“It inspired me to design a filter without the use of membranes, to decrease the costs and maintenance needs associated with water filtration,” she explained.

Over time, her design evolved into a three-part system: one chamber for the water, one for the ferrofluid, and a smaller unit where the actual separation happens.

The principle is fairly direct. The ferrofluid sticks to microplastic particles, and a magnetic field pulls the whole mixture out of the water. Then the fluid gets recovered and reused, so the system doesn’t rely on disposable components.

Microplastics Are Spreading Fast, Even Inside Us

Microplastics are defined by the Environmental Protection Agency as particles between 1 nanometer and 5 millimeters. They’re small enough to pass through many filtration systems and, as it turns out, to make their way into living organisms.

Research mentioned in the source shows they’ve been found in more than 1,300 species. As reported by Matthew J. Campen at the University of New Mexico, these particles have been detected in parts of the human body ranging from the brain to bone tissue.

The same source noted that levels in human brain samples have increased by about 50 percent in less than a decade. Scientists are still trying to pin down what that means.

“There are still a lot of questions as to whether these plastics are really impacting our health at this point,” said Campen, “there might be issues for cardiovascular disease and potentially neurological disease.” 

Strong Early Results, But Big Questions Ahead

To check how well her system worked, Heller built her own turbidity sensor to track particles in the water. According to the source, her prototype removed 95.52 percent of microplastics and was able to recover 87.15 percent of the ferrofluid.

That puts it in the same range, or even slightly above,what traditional water treatment plants can achieve, which is typically between 70 and over 90 percent.

There are still some open issues. Campen stated that one key point will be making sure the captured microplastics can be safely disposed of without creating new pollution. Another challenge is scale, since ferrofluid remains expensive to produce in large amounts.

For now, Heller sees her system as something that could fit under a kitchen sink rather than inside a large treatment plant. She’s planning to have her results professionally tested before thinking about what comes next.