Polar Pure Iodine Water Filter Purifier Sterilizes 2,000 Quarts NONE Imported EPA CERTIFIED to exceed the minimum threshold for sterilization. Treats up to 2,000 liters of water, unlike tablets which can decontaminate only 25 liters KILLS ALL BACTERIA AND VIRUSES before they mutate. Tablets can let organisms mutate and become immune. Filtration straws cannot filter out viruses, which are too small at .0004 microns MOST COST EFFECTIVE decontamination system at just 1 penny per quart. Tablets cost 12 cents per cup INDEFINITE SHELF LIFE when bottle is kept tightly capped. Tablets have to be used in short order once the bottle is unsealed EASY-TO-USE, COMPACT BOTTLE weighs just 5 ounces and fits in the palm of your hand. Integrated temperature gauge lets you know exactly the dosage to use to render water potable