The Water Test

The Water Test turns your iPhone into a microplastics reader for the at-home test kit.

Order a kit at thewatertest.com, run a tap-water sample through the filter, then rest your phone on the kit box and capture the filter. The app uses a long-exposure, multi-frame capture tuned for the fluorescent stain, then shows you a particle count — Low, Medium, High, or Very high — with the analysis views.

• Purpose-built capture: locked focus, manual exposure, and frame-stacking for a clean, repeatable image • A clear particle count and severity • Your history saved on-device — revisit any test with location and date • Pinch-to-zoom on every image • No account required

The Water Test is a companion to the physical test kit