Even if you have a great water filter, it's hard to destroy water-borne pathogens, including Giardia cysts that can pass through the smallest of filters. This disinfectant destroys these hazards with the power of pure Iodine Crystalline. This specially designed bottle has a thermometer that determines the iodine solution and temperature. One lightweight bottle can purify up to 2,000 quarts of water. Perfect for travel, the disinfectant has an indefinite shelf life and does not deteriorate when exposed to temperature extremes. Features: Safe and fully effective as long as iodine crystals are visible at the bottom of the bottle One bottle treats up to 2000 quarts of water at less than 1/2 cent per quart Dosage chart printed on the bottle Bottle cap measures and decants solution -- no other equipment needed Compact and lightweight for convenient packing Essential for emergency preparedness Item Specifications: Active ingredient: 99.5% Iodine Crystalline Capacity: Purifies up to 2,000 qts. Weight. 3 oz.