Thats Iodine. Iodine requires more contact time and is not effect on Cryptosporidium and has little effect on Giardia.
Combined with filtering, Iodine can easily kill any remaining virus.
Chlorine Dioxide is the only single use chemical that kills all with 3+ hours.
See
https://www.cdc.gov/healthywater/pdf/drinking/Backcountry_Water_Treatment.pdf
“I went to the woods because I wished to live deliberately...” ― Henry David Thoreau
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“I went to the woods because I wished to live deliberately...” ― Henry David Thoreau
^^^ Useful chart.
A traditional, simple and very effective method of disinfecting water is to boil water and make tea. Kills everything, including virues.
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