Water Purification Tablets With PA PlusUsed and trusted by military and emergency organizations worldwide, Potable Aqua Water Purification Tablets With PA Plus disinfect contaminated drinking water in any situation. Included are two types of tablets: Drinking Water Germicidal Tablets to make water bacteriologically suitable to drink, and PA Plus tablets to neutralize the after-taste and color in the water. It only takes two germicidal water purification tablets and two PA Plus tablets to disinfect one quart (one liter) of water. These portable water treatment tablets are effective against bacteria and Giardia lamblia.