Ultraviolet ( UV ) light.
https://www.emergency-wash.org/water/en/technologies/technology/ultraviolet-uv-light
👉🏼 PDF: https://app.box.com/s/wl5npi0glt0l8kfaw76r4lrs2t42hlyi
Under correct design and operational conditions, Ultraviolet (UV) Light can have anti-bacterial and anti-viral properties and can destroy pathogenic organisms in nonturbid water.