Instructions / Assembly

Maintenance Instructions
Your iSpring US21B under-sink water system requires periodiccare and cleaning throughout its
lifetime. It is recommended that the cartridges be replaced every 12-24 months, depending on
the number of contaminants present in the water supply. If the system has been functioning
properly and the pressure is slowing, this could indicate that it is time to change the filter
cartridges.
Replacement cartridges and parts can be ordered online at
www.123filter.com or
by calling 678-261-7611.
Filter Change Instructions
Step 1- Remove Old Cartridges
1.1 Turn off the water supply to the system. Open a nearby faucet to release the
remaining pressure and drain the water.
1.2 Unscrew the housings using the filter wrench included (AWR3) with your system, or
a commercially available “strap” type wrench.
1.3 Locate and remove the large O-ring using a small, clean flat head screwdriver. Avoid
removing any of the lubricant, and set it aside in a clean, safe place.
1.4 Remove and discard the old filter cartridges.
Step 2- Clean the Housings
2.1 Scrub the housings and caps with a mixture of warm water and about 2 tablespoons
of household bleach using a sponge or soft rag. For your safety, wear rubber gloves.
Rinse all parts very thoroughly!
2.2 Lubricate the O-ring with clean silicone grease if needed. DO NOT USE PETROLEUM
JELLY. Insert the O-ring into the filter groove and press into place. Verify the O-ring is
seated correctly.
CAUTION:
This step ensures the proper filter seal. Make sure the O-rings (ORB) are level when
seated in the groove. If the O-ring appears damaged, stretched, or crimped, it should be
replaced immediately.