Aquatabs are safe, simple iodine-free water purification tablets that effectively kill micro-organisms found in water such as Giardia cysts, bacteria, and viruses. Fast acting effervescent (fizzy) formula - water is ready to drink in 30 minutes after mixing with no unpleasant taste or odor. Aquatabs NaDCC formula has been used by Aid Agencies in emergencies, NGO's and Defence Forces around the world for over 20 years. Produced to international standards for use in drinking water with NSF/ANSI Standard 60 certification. Now approved in California. 30 tablet foil pack treats up to 60 quarts.