It is said the human body can not survive more than 3 days with out water and to drink bad water at that point could be deadly. Don't let this happen to your family in an emergency. This kit has 3 packets that treat 25 gallons each for a total of 75 gallons of water making it clean and taste good. The kit removes dirt, cysts, pollutants and kills viruses and bacteria. Don't wonder if that water is safe to drink, store this kit away for that unexpected emergency.