Virginia Teen Invents Magnetic Water Filter That Captures Nearly 96% of Microplastics

A Virginia high school student, Mia Heller, built a three‑chamber ferrofluid–based water filter that uses a magnetic field to pull microplastic particles from water and recover the ferrofluid for reuse. In testing, the device removed about 95.5% of microplastics and recovered 87% of the ferrofluid, performing in the same range as some traditional treatment plants. The concept could fit under-sink use, but challenges remain in safely disposing of captured plastics and scaling ferrofluid production for larger applications, with results pending professional testing.