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CARE AND MAINTENANCE
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 0.30 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 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
of this Performance Data Sheet for further information.
Arsenic Facts
Arsenic (abbreviated As) is found naturally
in some well water. 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 environ-
mental health agency can provide a list
of certified labs. The cost is typically $15
to $30. Information about arsenic in wa-
ter 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). In well water,
arsenic may be pentavalent, trivalent, or a
combination of both. Special sampling pro-
cedures 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 Sys-
tems do not completely remove trivalent
arsenic from water. RO Systems are very
effective at removing pentavalent arsenic.
A free chlorine residual will rapidly convert
• Efficiency rating is the percentage of
the influent water to the System that
is available to the user as reverse
osmosis treated water under operating
conditions that approximate typical
daily usage.
NEED HELP? GIVE US A CALL 833.232.9711
trivalent arsenic to pentavalent arsenic.
Other water treatment chemicals such as
ozone and potassium permanganate will
also change trivalent arsenic to pentava-
lent 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 util-
ity to find out if free chlorine or combined
chlorine is used in the water System. The
AO-US-RO-4000 System is designed to
remove pentavalent arsenic. It will not
convert trivalent arsenic to pentavalent
arsenic. This System was tested in a lab. Un-
der testing conditions, the System reduced
[0.30 mg/L (ppm) or 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 with your installation.
Have the treated water tested for arsenic
to check whether the System is working
properly.
The RO component of the AO-US-RO-4000
System must be replaced every 1-3 years to
ensure 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.
• Recovery rating is the percentage of
the influent water to the membrane
portion of the System that is available
to the user as reverse osmosis treated
water when the System is operated
without a storage Tank or when the
storage Tank is bypassed.
Performance Data for the Drinking Water System AO-US-RO-4000
Models
Replacement
Operating
Operating
Recovery
pressure range
temp. range
rating
AO-US-
AO-4000-CARBON
40-100 psi
40-90° F
29.43%
RO-4000
and AO-RO-RM-R
275-689 kPa
4.44-32.2° C
Manufactured by: A.O. Smith Corporation 11270 West Park Place | Milwaukee, WI 53224 | 877.333.7108
Testing Performed under NSF/ANSI Standards 42, 53, 58, 401 & P473 and in accordance with the California Department of Health Services Drinking Water Treatment Device Program.
This System has been tested according to NSF/ANSI 42, 53, 401 & P473 for reduction of the substances listed below. The concentration of the indicated substances in water entering
the System was reduced to a concentration less than or equal to the permissible limit for water leaving the System, as specified in NSF/ANSI 42, 53, 58, 401 & P473.
NSF/ANSI 42
Minimum Reduction Overall % Reduction Results
Chlorine Reduction, Free Available
<0.5 mg/l
97.66%
Chloramine Reduction, Free Available <0.5 mg/l
97.66%
Particulate Reduction
85%
99.9%
NSF/ANSI 53
Minimum Reduction Overall % Reduction Results
Cyst Live Cryptosporidium & Giardia 99.95%
>99.99%
Mercury Reduction pH 8.5
<2 ug/L
>95.8%
Mercury Reduction pH 6.5
<2 ug/L
>96.5%
Lead Reduction pH 6.5
<10 ug/L
>99.4%
Lead Reduction pH 8.5
<10 ug/L
>99.3%
MTBE Reduction
<5 ug/L
86.6%
Turbidity
<0.5 NTU
99.1%
VOC Surrogate Test
95%
99.4%
Asbestos
99%
>99%
Maximum
Minimum
NSF/ANSI 58
Overall % Reduction Results
Concentration
Reduction
Arsenic Pentavalent
0.30mg/L ± 10% 80.0%
97.6%
Barium
10.0mg/L ± 10% 80.0%
95.2%
Cadmium
0.30mg/L ± 10% 83.3%
95.3%
Chromium Hexavalent 0.30mg/L ± 10% 66.7%
97.0%
Chromium Trivalent
0.30mg/L ± 10% 66.7%
96.6%
Copper
0.30mg/L ± 10% 56.7%
96.6%
Fluoride
8.0mg/L ± 10%
81.2%
95.7%
Lead
.15mg/L ± 10%
93.3%
96.6%
Nitrate/Nitrite
30.0mg/L ± 10% 66.7%
82.4%
Radium 226/228
25pCi/L ± 10%
80.0%
80.0%
Selenium
0.10mg/L ± 10% 50.0%
97.9%
TDS
750mg/L ± 10%
75.0%
95.0%
Turbidity
11 ± NTU
95.4%
99.1%
NSF/ANSI 401 Maximum
Minimum Reduction
Overall % Reduction Results
Concentration
Atenolol
30 ng/L
94.2%
94.2%
Bisphenol A
300 ng/L
98.80%
98.9%
Carbamazepine 200 ng/L
98.6%
98.6%
DEET
200 ng/L
98.7%
98.7%
Estrone
20 ng/L
96.30%
96.5%
Ibuprofen
60 ng/L
95.3%
95.4%
Linuron
20 ng/L
96.6%
96.6%
Meprobamate
60 ng/L
94.7%
94.7%
Metolachlor
200 ng/L
98.6%
98.6%
Naproxen
20 ng/L
96.3%
96.4%
Nonyl phenol
200 ng/L
97.50%
97.5%
Phenytoin
30 ng/L
95.50%
95.6%
TCEP
700 ng/L
98%
98%
TCPP
700 ng/L
97.8%
97.8%
Trimethoprim
20 ng/L
96.7%
96.7%
Influent challenge
Maximum permissible
Overall %
NSF P473
concentration
concentration
reduction
Perfluorooctanoic
acid (PFOA) &
1.5 ±10% ug/L
0.07 ug/L
96%
Perfluorooctane
sulfonate (PFOS)
• All contaminants reduced by this filter are listed.
• Not all contaminants listed may be present in your water.
• Does not remove all contaminants that may be present in tap water.
Filter is only to be used
Systems certified for cyst reduction
with cold water.
may be used on disinfected waters
that may contain filterable cysts.
Filter usage must comply
with all state and local laws.
See owner's manual for general
installation conditions and needs plus
Testing was performed under
manufacturer's limited warranty.
standard laboratory conditions,
actual performance may vary.
Efficiency
Daily
rating
Production (DPR)
17.91%
13.32 gallons
50.4 liters
Organic chemicals included by surrogate testing
Pass
VOCs
Drinking
Influent/
Effluent/
(by surrogate testing
water
Unfiltered
Filtered
Pass
using chloroform)
regulatory
Pass
level (MCL/
MAC) mg/L
alachlor
0.002
0.050
0.001
Pass
atrazine
0.003
0.100
0.003
Pass
benzene
0.005
0.081
0.001
Pass
carbofuran
0.04
0.190
0.001
Pass
carbon tetrachloride
0.005
0.078
0.0018
Pass
chlorobenzene
0.1
0.077
0.001
chloropicrin
—
0.015
0.0002
Pass
2,4-D
0.07
0.110
0.0017
Pass
dibromochloropropane (DBCP)
0.0002
0.052
0.00002
Pass
o-dichlorobenzene
0.6
0.080
0.001
Pass
p-dichlorobenzene
0.075
0.040
0.001
1,2-dichloroethane
0.005
0.088
0.0048
1,1-dichloroethylene
0.007
0.083
0.001
cis-1,2-dichloroethylene
0.07
0.170
0.0005
Pass
trans-1,2-dichloroethylene
0.1
0.086
0.001
Pass
1,2-dichloropropane
0.005
0.080
0.001
Pass
cis-1,3-dichloropropylene
—
0.079
0.001
Pass
dinoseb
0.007
0.170
0.0002
Pass
endrin
0.002
0.053
0.00059
Pass
ethylbenzene
0.7
0.088
0.001
Pass
ethylene dibromide (EDB)
0.00005
0.044
0.00002
haloacetonitriles (HAN)
Pass
bromochloroacetontrile
—
0.022
0.0005
Pass
dibromoacetontrile
—
0.024
0.0006
Pass
dichloroacetontrile
—
0.0096
0.0002
Pass
trichloroacetontrile
—
0.015
0.0003
Pass
haloketones (HK)
Pass
1,1-dichloro-2-propanone
—
0.0072
0.0001
1,1,1-trichloro-2-propanone
—
0.0082
0.0003
heptachlor (H-34, Heptox)
0.0004
0.025
0.00001
heptachlor epoxide
0.0002
0.0107
0.0002
Pass
hexachlorobutadiene
—
0.044
0.001
Pass
hexachlorocyclopentadiene
0.05
0.060
0.000002 >99%
Pass
lindane
0.0002
0.055
0.00001
Pass
methoxychlor
0.04
0.050
0.0001
Pass
pentachlorophenol
0.001
0.096
0.001
Pass
simazine
0.004
0.120
0.004
Pass
styrene
0.1
0.150
0.0005
1,1,2,2-tetrachloroethane
—
0.081
0.001
Pass
tetrachloroethylene
0.005
0.081
0.001
Pass
toluene
1
0.078
0.001
Pass
2,4,5-TP (silvex)
0.05
0.270
0.0016
Pass
tribromoacetic acid
—
0.042
0.001
Pass
1,2,4-trichlorobenzene
0.07
0.160
0.0005
Pass
1,1,1-trichloroethane
0.2
0.084
0.0046
1,1,2-trichloroethane
0.005
0.150
0.0005
Pass
trichloroethylene
0.005
0.180
0.0010
Pass
Influent/
Effluent/
trihalomethanes (THMs)
Unfiltered
Filtered
Results
bromodichloromethane (THM)
bromoform (THM)
0.080
0.300
0.015
chloroform (THM)
Pass
chlorodibromomethane (THM)
xylenes (total)
10
0.070
0.001
System Tested and Certified by NSF International against
NSF/ANSI Standards 42, 53, 58 & 401 and conforms to
NSF protocol P473 for reduction of claims specified on the
Performance Data Sheet and at www.nsf.org.
COMPONENT
For use with municipally treated water only. Do not use with
water that is microbiologically unsafe or of unknown water
quality without adequate disinfection before or after the System.
15
Percent
Reduction
>98%
>97%
>99%
>99%
98%
>99%
99%
98%
>99%
>99%
>98%
95%
>99%
>99%
>99%
>99%
>99%
99%
99%
>99%
>99%
98%
98%
98%
98%
99%
96%
>99%
98%
>98%
>99%
>99%
>99%
>97%
>99%
>99%
>99%
>99%
99%
>98%
>99%
95%
>99%
>99%
Percent
Reduction
95%
>99%
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