Culligan Aquasential RO Owner's Manual page 13

Arsenic
Arsenic (As) is found naturally in some well water� Arsenic in water has no color, taste or odor� It must be measured by
a lab test� Public water utilities must have their water tested for arsenic� You can get the result from your water utility�
If you have your own well, you can have the water tested by an accredited lab� The local health department or the
state environmental health agency can provide a list of certified labs� Culligan International is one such lab� For more
information please contact your local Culligan dealer� Additional information about the arsenic in water can be found
through the EPA's website at www�epa�gov�
There are two forms of arsenic: pentavalent arsenic (As (V)) and trivalent arsenic (As (III))� Special sampling procedures are
needed for a lab to determine what type and how much of each type of arsenic is in the water� In well water, arsenic may be
pentavalent, trivalent, or a combination of both� Reverse osmosis membranes are effective at reducing pentavalent arsenic
but not trivalent arsenic� The Arsenic specific cartridge was specifically designed to reduce trivalent arsenic�
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