As stated previously, a five micron sediment pre-filter and a 2 micron carbon pre-filter remove suspended solids, chlorine, organic chemicals, and anything larger than 2 microns.

        The water then proceeds to the Reverse Osmosis membrane. Its pores are so tiny (about 6/10,000th of a micron or 1/50,000th of an inch), it removes more contaminants from the water, including viruses, bacteria, and cysts (especially Giardia and Cryptosporidium). In addition, here is a partial list of other contaminants removed by the FilmTec Special Performance Membrane. (The percentages are a conservative estimate.)

TYPICAL  SPECIAL  PERFORMANCE  MEMBRANE  REJECTION  RATE*

Material/Element% RemovedMaterial/Element% Removed
Arsenic +370% Arsenic +598%
Barium97%Bicarbonate94%
Cadmium97%Calcium97%
Chloride92%Chromate97%
Copper97%Detergents97%
Fluoride98%Herbicides97%
Insecticides97%Lead97%
Magnesium97%Nickel97%
Nitrates80%PCBs97%
Potassium92%Radium97%
Selenium97%Silicate96%
Silver85%Sodium92%
Strontium97%Sulfate97%
Tot.Dissol.Solids90%
* Feed water: 60 psi, 76 degrees Fahrenheit, pH of 8

Here are some additional contaminants which the FilmTec membrane removes from the water. [To view this chart, you will need to use the Adobe Acrobat Reader software available free from Adobe Systems Incorporated. This software allows you to view, navigate and print PDF (Portable Document Format) files.]

List of solutes removed