Coghlan's Emergency Drinking Water Germicidal Tablets rapidly dissolve to make most water suitable for drinking in emergency situations. Two of these germicidal iodine-based tablets will disinfect approximately one quart of water, making it safe for human consumption. Perfect for any first aid or survival kit, these tablets give peace of mind that you'll have a backup plan for disinfecting water.FeaturesEasy to use50 tablets per bottleTreat up to 25 quarts per packageIodine-based, chlorine-freeFor emergency use only