Chances of getting a pathogenic infection inside the solar still desalination is very low ,almost zero. the thermo+ uv enhanced photo rays combination itself acts as a disinfectant, which does not provide a room for the ambient condition inside the setup for any pathogens (mesophilic and thermophilic) to grow. so the condition inside the setup can be guaranteed as a infection free ambience.
similarly, these heat are enough to make the setup and also the water inside it foul smell proof,as the main source for these smell is because of the presence of moisture trapped inside the sponge during operation.prolonged heating maintains almost dried condition inside the sponge which has thin chances of producing foul smell.
yet,the chances of getting a pathogenic infection or foul smell or pathogenic infection ad foul smell is very high,if the setup is kept in shade for long time,eventually building an ambience for anaerobic pathogens to grow and fouls smell to rise up inside it