Most do not reduce cysts, asbestos, THMs, pesticides, VOCs, etc. Filters must be replaced every 35 gallons, greatly increasing its initial cost. Often promotes bacterial growth. Limited contact time with the carbon greatly reduces its efficiency. Silver-Powdered Charcoal Filters Same as powdered charcoal filters above.
Silver is used to inhibit bacterial growth.
Must be registered with the EPA as containing a poisonous substance-silver. No independent ability to remove all chemicals the chemicals can vaporize and recondense into the distilled water. Stored water can contribute to mold and bacterial growth. Removes minerals and trace minerals essential to good health. Boiling water increase the levels of other contaminants.