Aeration is the recommended method for treatment of public water supplies.
When radon is adsorbed on GAC, it decays with a half-life of 3.8 days to produce a series of radioactive decay products. The first 4 decay products of radon have short half-lives all less than 30 minutes. At the present, there are no federal regulations specifically applicable to the disposal of GAC containing natural radionuclides. The results of this work indicated a removal fraction of radon from drinking water of approximately 0.95. More restrictive requirements on the disposal of solid waste containing natural radionuclides would limit the feasibility of using GAC to remove radon from drinking water.