Aquamira Water Treatment, 2 Oz, Part A and B, Chlorine Dioxide The 2oz. size is perfect for treating stored water in 55 gallon or smaller drums Treats drinking water using chlorine dioxide to kill bacteria. Convenient and economical 2oz. size for treating larger batches of water. Control the build up of slime and improve the taste of stored water. Each kit contains everything you need to treat up to 60 gallons of water.