Seychelle RADIOLOGICAL Replacement FilterThe Radiological filter removes the four basic zones of contamination: Aesthetic (Chlorine, taste and odor), Chemicals (from Industry and Agriculture), Dissolved Solids (heavy metals such as lead, mercury, Chromium 6) and up to 99.99% of Radiological Contaminants such as Gross Beta, Radon 222, Alpha Radium 226, Plutonium, Uranium, Cesium 134 and 137. Removes up to 90% of fluoride. (Not to be used with salt water)