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CARE & SAFEGUARDS
This system has been tested for the treatment of water containing pentavalent arsenic
(also known as As(V), As(+5), or arsenate) at concentrations of 0.05 mg/L or less. This
system reduces pentavalent arsenic, but may not remove other forms of arsenic. This
system is to be used on water supplies containing a detectable free chlorine residual at
the system inlet or on water supplies that have been demonstrated to contain only 50 ppb
(0.050 mg/L) pentavalent arsenic. Treatment with chloramine (combined chlorine) is not
sufficient to ensure complete conversion of trivalent arsenic to pentavalent arsenic. Please
see the Arsenic Facts section below for further information.
Arsenic Facts
Arsenic (As) is a naturally occuring
contaminant found in many ground
waters. Arsenic in water has no color, taste
or odor. It is measured by a laboratory
test. Public water utilities 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
tested. The local health department or the
state environmental health agency can
provide a list of certified labs. Information
about arsenic in water can be found on
the internet at the U.S. Environmental
Protection Agency website:
epa.gov/safewater/arsenic
There are two forms of arsenic: pentavalent
arsenic (As(V), As(+5), and arsenate) and
trivalent arsenic (also called As(III), As(+3),
and arsenite). Although both forms of
arsenic are potentially harmful to human
health, trivalent arsenic is considered
more harmful than pentavalent arsenic.
In water, arsenic may be pentavalent,
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
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with the labs in your area to see if they can
provide this type of service.
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 AOS-HERO-CHR
system is designed to remove pentavalent
arsenic only. It will not convert trivalent
arsenic to pentavalent arsenic. This
System was tested in a lab. Under testing
conditions, 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 removal performance
of pentavalent arsenic of the system may
be limited due to water quality conditions
(i.e. iron-containing water or other water
quality conditions). Have your treated
water tested for arsenic to check whether
the system is working properly.
The SmartFlow™ Membrane of the AOS-
HERO-CHR system must be replaced every
12 months to ensure system will continue to
remove prevalent arsenic. The component
identification and locations where you can
purchase the component are listed in the
installation/operation manual.
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