Nuclear Contaminant Protection: R.A.D. (Radiological) Replacement Filter for 28oz Bottle Removes Radiological (Radiation) Contaminates from drinking water. Removes up to 99.99% Radiological contaminants: Gross beta, alpha radium 226, cesium 137 & 134, uranium, and radon 222 Filters made in the USA and tested Nationally and Internationally Designed to be used with chlorinated municipal water. Not to be used with salt water. Filters up to 150 gallons RAD Filters are also tested to remove up to 99.99% of the following zones of contamination: Aesthetic contaminants: Unpleasant taste, odors, 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, 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