ALFA1 Patented Military Canteen Personal Water Filtration System (PWFS) is designed and manufactured to strict military specifications and standards in 1 quart and 2 quart capacities. Canteen is constructed of durable USFDA Grade composite plastic resins and materials with a unique screw-cap enclosure designed for positioning and retaining patented ALFA1 Cartridge System and dispensing the filtered water on demand. Our patented ALFA1 Filtration Cartridge System is designed to provide fresh, clean water free of contaminants – anytime, anywhere up to 500 liters. This specially developed patented portable water purification system ensures an instant flow of fresh drinking water, free from suspended particles, chemical, impurities, bacteria, heavy metals, organic compounds and pesticides.