A filter with granular activated carbon (GAC) is a proven option to remove certain chemicals, particularly organic chemicals, from water.  GAC filters also can be used to remove chemicals that give objectionable odors or tastes to water such as hydrogen sulfide (rotten eggs odor) or chlorine.

Raw coal crushed activated carbon

However, other chemicals, like iron and nitrate, are not attracted to the carbon and are not removed and another type of filter, such as reverse osmosis (RO) or green sand may be needed.  RO filters will also remove certain organic chemicals. This information only addresses GAC filters.

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This information was prepared in cooperation with the federal Agency for Toxic Substances and Disease Registry (ATSDR). This statement does not imply that ATSDR has endorsed this information sheet.