EVERPURE
®
PRO-Reverse Osmosis Water Filtration System Installation and Operating Instructions • 17
Arsenic Fact Sheet
Arsenic (abbreviated 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 results from your
water utility. If you have your own well, you can have the water
tested. The local health department or state environmental
health agency can provide a list of certified labs. The cost is
typically $15–$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 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 with the labs in your area to see if they can provide this
type of service.
Reverse osmosis (RO) water treatment systems do not remove
trivalent arsenic from water very well. RO systems are very
effective at removing pentavalent arsenic. A free chlorine residual
will rapidly convert 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 chlorine residual (also called chloramine)
may not convert 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 PRO system is designed to remove pentavalent arsenic.
It will not convert trivalent arsenic to pentavalent arsenic.
The system was tested in a lab. Under those conditions, the
system reduced 0.30 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 system is working properly.
The RO component of the PRO system must be replaced every
12–24 months to ensure the system will continue to remove
pentavalent arsenic.
CALIFORNIA PROPOSITION 65 WARNING
This product contains chemicals known to the
State of California to cause cancer or birth
defects or other reproductive harm.
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