Ultraviolet (UV) Lamp.
https://www.emergency-wash.org/water/en/technologies/technology/ultraviolet-uv-lamp
👉🏼 PDF: https://app.box.com/s/cg3k6u6n4o7ujsth7urn238fe7y8192a ____
A UV Lamp is a non-chemical means of disinfecting water at household level, effective against all classes of pathogens and requiring only seconds of contact time. It uses short-wavelength UV irradiation in the range of 200–300 nm generated from mercury lamps or from UV light-emitting diodes (LEDs).