Potable Aqua Water Purification disinfects contaminated drinking water in any situation. Potable Aqua is used worldwide by campers, hikers, militaries, emergency organizations and anyone needing to drink water of questionable bacteriological quality. For use only when drinking water is suspected or known to be bacteriologically substandard. Don't be caught without a source of potable water. Potable Aqua is a lightweight backup to your personal water filter straw, gravity filter, or hand pump water filter.