Non-potable Water Sources:
Do not attempt to use this product to make safe drinking water from non-potable water sources. Do not use
the system on microbiologically unsafe water, or water of unknown quality without adequate disinfection
before or after the system. This system is certified for cyst reduction and may be used on disinfected water
that may contain filterable cysts.
Arsenic Reduction:
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 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. The cost is
typically $15 to $30. Information about arsenic in water can be found on the Internet at the U.S. Environ-
mental 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 HF-RO system is designed to remove pentavalent arsenic. It will not convert trivalent arsenic to
pentavalent arsenic. The system was tested in a lab. Under testing conditions, the system reduced 0.3
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 whether the system is working properly.
The RO component of the HF-RO system must be replaced every 1-3 years to ensure that the system will
continue to remove pentavalent arsenic. The component identification and locations where you can purchase
the component are listed in the installation/operation manual.
Nitrate/Nitrite Test Kit:
This system is acceptable for treatment of influent concentration of no more than 27mg/L nitrate and 3mg/L
nitrite in combination measured as N.* This system is supplied with a nitrate/nitrite test kit. Product water
should be monitored periodically according to the instructions provided with the test kit.
*Nitrate/Nitrite reduction is not part of NSF Certification.
Installations in The Commonwealth of Massachusetts:
The Commonwealth of Massachusetts requires installation be performed by a licensed plumber and do not
permit the use of saddle valves. Plumbing code 248—CMR of the Commonwealth of Massachusetts must be
followed in these cases.
