Water Needed
18 L
Gallons
4.8
Time
18 min
Total Water Needed
18 L
4.8 gallons
Treatment Time
18 min
Est. Cost
$0.10
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Inputs
Result
2 × 3 × 3 = 18 L. Pump filter at 1 L/min = 18 minutes total treatment time.
Inputs
Result
1 × 5 × 3 = 15 L. UV at 1 L/min = 15 minutes.
Plan 2–4 liters per person per day depending on temperature and exertion. Hot weather or strenuous hiking can require 4+ liters.
| Condition | Liters/Day | Gallons/Day |
|---|---|---|
| Cool, easy | 2–2.5 L | 0.5–0.7 gal |
| Moderate | 3 L | 0.8 gal |
| Hot, strenuous | 4+ L | 1+ gal |
UV purifiers (SteriPEN) and pump filters treat 1 liter per minute. Chemical tablets take 30+ minutes. Boiling takes 5–10 minutes per liter including heat-up time.
Yes. Even clear mountain streams can contain Giardia, Cryptosporidium, and bacteria. Always treat water from natural sources unless it is a tested and maintained spring.
Chlorine dioxide or iodine tablets kill bacteria, viruses, and protozoa. Drop one tablet per liter, wait 30 minutes (4 hours for Crypto with chlorine dioxide).
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Last Updated: Mar 26, 2026
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