Purenex Multipure Aqua RO System User Manual
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California Department of Public Health
Certification / Registration
Facts About Arsenic
(in compliance with NSF
Standard 58)
Arsenic (abbreviated As) is a naturally occurring
contaminant found in many ground waters.
Arsenic in water has no color, taste or odor. It
must be measured by a lab test. Public water utili-
ties must have their water tested for arsenic. You
can get the results from your water utility. If you
have your own well, you can have the water test-
ed. The local health department or the state envi-
ronmental health agency can provide a list of certi-
fied labs. The cost is typically $15 to $30.
Information about arsenic in water can be found on
the Internet at the US Environmental Protection
Agency website:
www.epa.gov/safewater/arsenic.html.
There are two forms of arsenic: pentavalent
arsenic (also called As(V), As(+5), and arsenate)
and trivalent arsenic (also called As(III), As(+3),
and arsenite). In well water, arsenic may be pen-
tavalent, trivalent, or a combination of both.
Special sampling procedures are needed for a lab
to determine what type and how much of each type
of arsenic is in the water. Check with the labs in
your area to see if they can provide this type of
service.
Reverse Osmosis (RO) systems are very effective
at removing pentavalent arsenic. However, RO
systems do not remove trivalent arsenic from water
very well. A free chlorine residual will rapidly con-
vert trivalent arsenic to pentavalent arsenic. Other
water treatment chemicals such as ozone and
potassium permanganate will also change trivalent
arsenic to pentavalent arsenic. A combined chlo-
rine residual (also called chloramine) may not con-
vert all the trivalent arsenic. If you get your water
from a public water utility, contact the utility to find
out if free chlorine or combined chlorine is used in
the water system.
The Multipure MP750 Plus RO is designed to
remove only pentavalent arsenic. It will not convert
trivalent arsenic to pentavalent arsenic.
This treatment system was tested in a laboratory to
remove pentavalent arsenic. Under lab conditions,
as defined in NSF/ANSI Standard 58, the system
reduced 0.050 mg/l (ppm) pentavalent arsenic to
0.010 mg/l (ppm) (the USEPA standard for drinking
water) or less. The performance of the system
may be different at your installation. Have the
treated water tested for arsenic to check if the sys-
tem is working properly.
The RO component of the Multipure MP750 Plus
RO system must be replaced as indicated in the
Owner's Manual to ensure the system will continue
to remove arsenic and other contaminants. The
component identification and locations where you
can purchase the component are listed in the
installation/operation manual.
Multipure International
7251 Cathedral Rock Drive
Las Vegas, NV 89128
800.622.9206 · 702.360.8880
www.multipure.com
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