Water Inc HP-RO-1000 - Manual (Page 14)

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
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 web site: 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
free chlorine or combined chlorine is used in the water
system.
The HP-RO-1000 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 HP-RO-1000 system must be
replaced every 12-24 months to ensure the system will
continue to remove pentavalent arsenic. The component
component are listed in the installation/operation manual.
14 • HP-RO-1000 Undersink Reverse Osmosis System