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I see that. Huh weird how some say 2 drops per and some say 4. I have always used 4 drops and never had an issue. Granted I live in Northern Ontario and most water sources are probably safe without...

To treat 1 liter/quart you should use 4 to 6 drops not 2.

http://www.doh.wa.gov/Emergencies/EmergencyPreparednessandResponse/Factsheets/WaterPurification