If you are on a trip and can't get to clean water, use the Potable Aqua(R) Water Purification Tablets for emergency H20 purification. This bottle contains enough tablets to treat 25 quarts of water. When camping, hiking or traveling, be certain your water is bacteria-free with the Potable Aqua(R) Water Purification Tablets. FEATURES: Emergency drinking water germicidal tablets Intended for emergency disinfection of drinking water Makes questionable water bacteriologically suitable for drinking Treats up to 25 quarts of water Used worldwide by campers, hikers, militaries and emergency organizations For use only when drinking water is suspected or known to be bacteriologically substandard Proven effective against Giardia Lamblia when used as directed For short term or limited emergency use only Ideal for camping, hiking and travel