Operating Guide
NEED HELP? GIVE US A CALL 877.333.7108
To clean your lter unit, wipe down
the exterior with a damp cloth.
Safeguards
• Use only COLD water with lter.
• If you experience a hose connection
leak, disconnect and re-seat the hose.
Do not use with water that is microbiologically unsafe or of unknown water quality without adequate disinfection before
or after the system. Systems certied for cyst reduction may be used on disinfected waters that may contain lterable cysts.
AO-MF
Replacement cartridge: AO-MF-R
Rated service ow: 1.4 gpm (5.3 lpm)
Max capacity: 1,389 gallons (5,258 l)
Min working pressure: 10 psi (68.95 kPa)
Max working pressure: 125 psi (861.8 kPa)
Min operating temperature: 40º F (4.44º C)
Max operating temperature: 90º F (32.22º C)
Performance Data Sheet for the A. O. Smith Main Faucet Water Filter
Models Replacement Operating pressure range Rated capacity Operating temp. range Rated ow
AO-MF
AO-MF-R
10-125 psi
68.95-861.8 kPa
1,389 gallons
5,258 liters
40-90º F
4.44 - 32.22º C
1.4 gpm
5.3 lpm
Manufactured by: A. O. Smith Corporation P.O. Box 1597 | Johnson City, TN 37605-1597 | 877.333.7108
NSF/ANSI 42 Min Reduction Overall % Reduction Results
Chlorine Reduction, Free Available 97.5% 97.5% Pass
Particulate Reduction 87.1% 95.9% Pass
NSF/ANSI 53 Min Reduction Overall % Reduction Results
Cyst Live Cryptosporidium & Giardia >99.99% >99.99% Pass
Lead Reduction pH 6.5 > 99.3% > 99.3% Pass
Lead Reduction pH 8.5 > 99.3% > 99.3% Pass
Atrazine 89.1% 93.7% Pass
Lindane 97.4% 98.8% Pass
Turbidity 97.3% 98.7% Pass
• All contaminants reduced
by this lter are listed.
• Not all contaminants listed
may be present in your water.
• Does not remove all contaminants
that may be present in tap water.
Testing Performed under NSF/ANSI Standards 42 and 53 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 and 53 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 specied in NSF/ANSI 42 and 53.
Filter is only to be used
with COLD water.
Filter usage must comply
with all state and local laws.
Testing was performed under
standard laboratory conditions,
actual performance may vary.
Systems certied for cyst reduction may be
used on disinfected waters that may contain
lterable cysts.
Read owner’s manual for general installation
conditions and needs, as well as manufacturer’s
limited warranty.
CARE & MAINTENANCE
4
System Tested and Certied by IAPMO R&T lab and IAPMO R&T against NSF/ANSI Standards
42 & 53. Please refer to the Performance Data Sheet for specic contaminant reductions.