The winner is invited to participate in the international Stockholm Junior Water Prize held each year during World Water Week in Stockholm, Sweden, where they will compete against entrants from more than 30 countries.

To see who's in the running, check out the video pitches below.

Western Australia

Uriah Daisybell, CAPS Coolgardie
Deadly Heavy Metals Filter: Using Carbon Coated Mussel Shells and High Magnetic Field Magnet for the Filtration of Heavy Metal-Contaminated Water

New South Wales

Macinley Butson, The Illawarra Grammar School
Development and Testing of a Film Based Detector System for Appropriate Ultraviolet Solar Disinfection (SODIS) of Water

Queensland

Maria Saito, Queensland Academy for Health Sciences
The Efficacy of Three Commonly Used Water Treatment Techniques on the Disinfection of Paramecium Caudatum Towards Drinking Water Purification

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