These emergency drinking water germicidal tablets are proven effective against Giardia Lamblia and contain an Iodine-based compound (no chlorine). They are used worldwide by campers, hikers, militaries, emergency organizations and anyone needing to drink water of questionable bacteriological quality.
Each Potable Aqua bottle contains 50 tablets, which is enough to disinfect 25 quarts of water. The container (a small bottle) is about 2 inches high and weighs only about one ounce.
Follow all manufacturer's instructions carefully.