Two-step treatment includes water purification tablets and a neutralizer to make water safe to drink without the color or taste of iodine. Iodine tablets kill bacteria, viruses, and giardia while the neutralizing tablets neutralize taste, odor, and color. Includes 50 of each tablet. 2 tablets treat 1 quart of water. Not effective against Cryptosporidium. Coghlan's. Twelve per case.