RARITYARare
Water Purification Tablets
When you can't boil and can't filter, a tablet still makes water safe to drink. It needs no power, fits in a pocket, and keeps for years.
Value Ratio
8.5/10
Versatility
7.0/10
Impact
7.5/10
Durability
7.0/10
Difficulty
1.5/10
Recommended FormChlorine dioxide (ClO₂), 1 tablet per litre
Best UsedGo-bag, travel, backup to the filter
ImportanceHigh
DifficultyBeginner
BacteriaVirusesGiardia
Won't removeChemicalsHeavy metalsSediment or cloudiness
No power, no boiling
Years on the shelf
Pocket-sized, treats litres
Per tablet1 litre
Wait~30 min
Shelf life~5 years
- Gravity Water FilterWater
- Rainwater Barrel CollectorWater
Cloudy water must be filtered or settled first; tablets disinfect, they don't clear.
Plain chlorine tablets are weak on Cryptosporidium; chlorine dioxide handles it, or filter it out.
Cold or cloudy water needs longer or a double dose; don't drink before the wait is up.
Store them sealed and dry; humidity ruins them, and they expire about a year after opening.