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Agree with most of the posts. Good resources. Recommend testing the water source before, and after SODIS "treatment", for e.coli, coliform, and any other lab tests available. NGO did local testing on stream and shallow well water, treated with SODIS for 24 and 48 hours, and found substantial numbers of bacteria still present. So bio risk may be improved, but not eliminated ... thus may not meet WHO guidelines of 1-4 colonies.