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A. Source water from Feed Water Adapter
→ B. Source water to 1st stage water inlet
C. Waste water from membrane →D. Waste water to Drain Saddle/drain pipe
E. RO water from stage 5 “T” fitting → F. RO water to Storage Tank
F. When the drinking faucet is opened, RO water from the tank passes through E and G → H. RO
water to the drinking faucet
Installation Steps
Before you begin the installation, it is highly recommended that you watch the
video “iSpring Reverse Osmosis Installation” on YouTube.
Note: If you plan on mounting/hanging the system, it is highly recommended to
include supports under each of the bottom three housings. Supports under the
housings will take the water weight off the housing threads, and ensure the thread strength does not
decay over the years.
Note: The booster pump (and UV stage if applicable) should remain unplugged until directed.
Note: Steps 1 – 7 are independent, and can be performed in any order.
Step 1: Installing the Feed Water Adapter (AFW43)
(The bushing can convert 3/8” comp. to ½” NPT. Refer to AFW43 user manual)
1.1 See Figure 5. Turn off the Cold Water Line via the Cold Water Supply Valve (CWSV) under the sink.
Open the kitchen faucet to release any pressure and make sure the water has stopped before proceeding to
the next step. Get a towel or bucket to catch any water drips. Disconnect the Kitchen Faucet Connector
(KFC) pipe from the CWSV.
1.2 Check to make sure the O-ring is seated inside the AFW43 female end, and twist it onto the CWSV.
Tighten it using a wrench or pliers.
1.3 Twist the KFC onto the male end of the AFW43. Turn the handle of the AFW43 to the perpendicular
OFF position. Turn on the CWSV slowly, and ensure you are getting a proper seal.
1.4 Connect the 1/4” RED tubing to the AFW43.
Feed Water Adapter with Bushing to convert 3/8” COMP to
½” NPT
The actual drain line tubing might be black or white.
www.123filter.com | (678) 261-7611 | support@123filter.com Page 8
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