Use and Care Guide
• Conforms to NSF/ANSI Standards 42, 53, 401, and NSF Protocol 
P473 for the specific performance claims as verified and 
substantiated by test data. See performance data sheet for 
individual contaminants and reduction performance.
• Systems certified for cyst reduction may be used on disinfected 
waters that may contain filterable cysts.
• Rated capacity: 200 Gallons (757 Liters).
AO-US-100-R
CLARYUM
®
 REPLACEMENT
FRESH 
FILTERS.
CLEAN
WATER.
 A. O. Smith Corporation | P.O. Box 1597
Johnson City, TN 37605-1597 | 877.333.7108
Turn off the water supply to 
your refrigerator or freezer 
filter. Release pressure from 
the system by activating the 
water dispenser in your 
refrigerator. Once there is 
no water coming from the 
water dispenser, you can 
change the filter.
1
Remove the plastic wrap 
from the replacement filter 
cartridge.
2
Hold the cartridge sump over 
the sink. Separate the two 
pieces of the sump by
turning the bottom portion 
of the sump to the left. Pour 
excess water down the drain. 
Pull down on the filter 
cartridge to disconnect it 
from the top half of the sump.
4
Insert and connect the new 
filter cartridge to the top half 
of the sump. Reattach the 
bottom of the sump to the 
top half by turning to the right 
and tightening. 
5
Reattach sump to the bottom 
of the top housing by making 
sure all connection points are 
aligned. Push the top of
the sump up into the bottom 
of the top housing and turn 
the sump to the right. Ensure 
that the sump is fully attached 
and locked in. 
6
Remove the cartridge sump 
from the filtration system 
by rotating it to the left 
and pulling down.
3
Once the filter cartridge has 
been changed and sump is 
securely attached to the top 
housing, slowly turn on the 
water supply to your refrigerator 
or freezer filter. Inspect the 
filtration system for leaks.
7
Allow filtered water to run 
through 2 gallons or until water 
is free from discoloration before 
drinking.
8
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. 
NEED HELP? GIVE US A CALL  877.333.7108NEED HELP? GIVE US A CALL  877.333.7108
INSTRUCTIONS:
for use with AO-FF
1
2
NOTE: If using the undercounter wrench provided 
with the original system, follow these steps.
Tested and Certified by NSF International against 
NSF/ANSI Standards 42, 53, 401 and conforms to 
NSF Protocol P473 in model AO-FF for the 
reduction of the claims specified on the 
Performance Data Sheet and at www.nsf.org.
Do not use tools other than undercounter wrench to remove or tighten sumps. Over tightening can cause damage and result in leaking.
REPLACEMENT
ELEMENT
Fresh filters, obsessively engineered 
to provide you with clean water. 
Take a few minutes. Change your 
filters. Whatever your water need - 
enjoy the next round of clean water.
If you need help or have a question, 
we’ve got you covered. Give us a call 
at 877.333.7108.
AO-US-100-R_20180504
Warranty information can be found at 
www.AOSmithatLowes.com
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AO-US-100R_replacement instructions_5-4-18.ai 1 5/4/18 2:03 PMAO-US-100R_replacement instructions_5-4-18.ai 1 5/4/18 2:03 PM



