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my answer didn't seem to make by email:

Dear all

Agree with the link – Eawag have done a lot of work on SODIS. Helvetas Swiss Intercooperation probably have the most experience with testing and implementing SODIS in their projects.

RWSN doesn’t do much in this area because it falls within the scope of the Household Water Treatment Network - https://hwts.web.unc.edu/ so they are good source of expertise on SODIS and others.

Also information here: https://akvopedia.org/wiki/UV_treatment_/_Solar_disinfection_%28SODIS%29 https://www.sswm.info/category/implementation-tools/water-purification/hardware/point-use-water-treatment/sodis

from the latter:

Advantages • Improves the microbiological quality of drinking water and therefore health • Extremely low-cost • Easy to understand and simple to use • Relies on locally available resources, plastic bottles and sunlight, a renewable energy source Disadvantages • Does not treat chemical pollution • Is strongly climate and weather dependent • Only small volumes can be treated at a time and regardless the simplicity, it is relatively time-consuming to cover the entire water consumption of a household with SODIS • Requires the availability of PET bottles (or plastic bags) • Needs large efforts in terms of promotion and information to have an impact

There has been some discussion about the health effects of using PET because of concerns (mainly in the US) about leaving water bottles in cars leading to some plastic contamination of the water. However, Eawag counter that in the SODIS context, the health risk from the plastic is orders of magnitude lower than the health risks associated with drinking microbially contaminated water. No magic bullets….