APPENDIX VII/WATER FILTERS: ACTIVATED CARBON FILTERS

Monday, April 20, 2009 12:58
Posted in category Allergies

There are two main methods of removing contaminants from water: activated carbon filters and reverse osmosis.

Activated carbon filters

Activated carbon is a highly reactive surface which attracts substances such as chlorine, chloroform, carbon tetrachloride, trichloroethyiene, phenols, DDT, other pesticides, PCBs and dioxins. These and other organic molecules found in tap water stick to the carbon leaving the water much less contaminated.

There are various forms of activated carbon, granular activated carbon or GAC being one of the most effective. The amount and quality of activated carbon in a filter determines how efficient it is at removing pollutants. Plumbed-in filters contain far more activated carbon than jug filters.

A major problem with these filters is that they are en ideal breeding ground for bacteria, including harmful forms. To combat bacterial growth, most such filters are now impregnated with silver. There have been alarming reports of silver leaching out into the water, and this can happen with some filters. But new production methods, such as bonding the silver to the carbon at high temperatues, can overcome this problem.

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