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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
The path the radiation travels from the sun to the pathogen in the SODIS process. #1: Radiation source; #2: Crossing through the container; #3: Crossing through the water; #4 Radiation that reaches pathogens.