Filters made in the USA and tested both Nationally and Internationally It can be used when the quality of water is unknown. Not to be used with saltwater. Filters up to 150 gallons Filters are easy to install Seychelle Extreme/RAD/ADVANCED Filters are tested to remove up to 99.99% of the following zones of contamination: Aesthetic contaminants: unpleasant taste, odors, cloudiness, silt, and chlorine Chemical contaminants: VOCs, toxic chemicals, trihalomethanes, PFOA, PFOS, PCBs, glyphosate, herbicides, detergents, pesticides (DDT), benzene, atrazine, and many more Inorganic contaminants: heavy metals, aluminum, asbestos, cadmium, chromium 6, copper, arsenic, nitrates & nitrites, lead, mercury, and up to 90% fluoride Radiological contaminants:gross beta, alpha radium 226, cesium 137 & 134, uranium and radon 222 This filter replacement is used with the 42oz Survival Canteen, 38oz canteen, 28oz bottles.