Water Purifier Methods

METHOD	WHAT IT DOES	LIMITATIONS	BRANDS
Activated Carbon Filter	Adsorbs organic contaminants that cause taste and odor problems. Some designs remove chlorination byproducts; Some types remove cleaning solvents and pesticides Efficient in removing metals such as lead and copper	Does not remove nitrate, bacteria or dissolved minerals	Brita
Ion Exchange	Removes minerals, particularly calcium and magnesium that make water “hard” Some designs remove radium and barium Removes fluoride	If water has oxidized iron or iron bacteria, the ion-exchange resin will become coated or clogged and lose its softening ability	Brita
Reverse Osmosis	Removes nitrates, sodium, other dissolved inorganics and organic compounds Removes foul tastes, smells or colors May also reduce the level of some pesticides, dioxins and chloroform and petrochemicals	Does not remove all inorganic and organic contaminants
Distillation	Removes nitrates, bacteria, sodium, hardness, dissolved solids, most organic compounds, heavy metals, and radionucleides Kills bacteria	Does not remove some volatile organic contaminants, certain pesticides and volatile solvents Bacteria may recolonize on the cooling coils during inactive periods

Source: EPA

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