Used and trusted by military and emergency organizations worldwide, Potable Aqua Water Purification Tablets With PA Plus disinfect contaminated drinking water in any situation. Included is the two-step process of water treatment for drinking water: Drinking Water Germicidal Tablets for water treatment to make water bacteriologically suitable to drink, and PA Plus tablets to neutralize the after-taste and color. At just .21 oz this item is a great addition to your camping gear or emergency preparedness kit, these water treatment tablets are effective against bacteria and Giardia lamblia.