Convenient and portable controlled-tip dropper bottle permits easy on-demand treatment for any water volume desired (minimum 12 hours). AquaDrop™ Treatment requires no electricity, power, equipment, mixing or stirring. Simply add the required amount of AquaDrop [1 drop for every 3.78 liters/1 gallon] to your containerized water and wait the required treatment time. AquaDrop has an extended shelf life and can be stored indefinitely. Read product label before use.