ETA Filters are the most Tested & Trusted Product of its Kind for Extreme Filtration in the world! They are tested to remove up to 99.99% of all 4 main zones of water contamination: Aesthetic contaminants: Unpleasant tastes, odours, cloudiness, silt, and chlorine Chemical contaminants: VOC’s, toxic chemicals, trihalomethanes, PFOA, PFOS, PCB’s, glyphosate, herbicides, detergents, pesticides (DDT), benzene, atrazine, and many more Inorganic contaminants: Heavy metals, aluminium, asbestos, cadmium, chromium 6, copper, arsenic, nitrates and nitrites, lead, mercury, and up to 90% fluoride Radiological contaminants: Radon 222 Features For use with the 28 oz ETA Alkalizing Portable Water Filter Removes, not just filters, up to 99.99% of main water contaminants Instantly alkalizes up to pH 9.5 Protects mineral and nutrient value in filtration Made in the USA Filters up to 100 gallons Tested to NSF/ANSI International Standards 42 & 53 Tested in more than 35 countries and 350 government and non-government laboratories around the world Powered by breakthrough IAMF technology Made of BPA-free non-leaching plastic Recyclable Easy to install Can be used when quality of water is unknown. Not to be used with saltwater.