Potable Aqua® Drinking Water Germicidal Tablets are intended for emergency disinfection of drinking water. When used as directed, they make most water bacteriologically suitable to drink. Used worldwide by campers, hikers, militaries, emergency organizations and anyone needing to drink water of questionable bacteriological quality. Potable Aqua® is for use only when drinking water is suspected or known to be bacteriologically substandard. Potable Aqua® Plus are neutralizing tablets for use after water has been treated with Potable Aqua®. P.A. Plus neutralizes the iodine after-taste and color in the water. Ready in just 35 minutes. Easy to use. Makes questionable water bacteriologically suitable to drink. Potable Aqua + tablets neutralize the iodine taste and color in the water. Proven effective against Giardia Lamblia when used as directed. Ideal for camping, hiking and travel. For use only when drinking water is of questionable quality. Is not for use on a continuous basis. Read the complete product label and follow all directions for use.