Water Preserver Conentrate added to fresh drinking water will allow it to be safety stored for an emergency up to 5 years!;Proprietary formula and strict laboratory analysis insure potenc;Safely treat and store water for 5 years without rotation.;The first and only product accepted and proven safe for 5-year water storage Proven effective in over 12 years of testing and use Recognized and licensed by U.S. and state EPA's