Community QuestionSeen on 11 CBTs

What are some methods to purify water? (Select all that apply)

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Answer

-Chemically treating water with chlorine or iodine -Purifying with a commercial micro filter -Boiling vigorously for at least one minute

All 11 indexed CBT versions give this answer·Answer index rebuilt Oct 15, 2026

VERIFIED AGAINST THE OFFICIAL SOURCE

“Boiling is the safest method for purifying water. Bringing water to a rolling boil for one minute at sea level will kill all waterborne pathogens. If above 8,000 feet, the boiling time should be extended to 3 minutes.”

— ATP 3-50.21, Survival (18 September 2018), Ch. 3 Water, para 3-41 ↗

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