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How to Add a Lead-Reduction Carbon (FI-PB1) Filter To Your R.O. System

The Lead-Reduction Carbon filter (FI-PB1) is recommended to be added to your R.O. system as a Stage-6 Specialty Filter.  Add this filter between the Stage-5 filter and the dispensing faucet as shown in the Diagram below. 

Some extra ¼” tubing are provided in case you need to make a longer connection.

  • Step 1:  Put the filter cartridge into the Housing (remove cartridge wrapping). Close the housing cap tightly. Read more

How to Connect Two Storage Tanks To APEC RO System

The two storage tanks should be hooked up side-by-side in parallel. The RO system fills up both tanks simultaneously. When you dispense pure water, water is drawn from both tanks simultaneously.

See figure below for tank connection:

  1. Add T-fitting to divert output into 2 directions   
    • Between points B and Y is the pure water line (Yellow line). Read more

Why Does the Water From My RO System Seems Cloudy?

The water out of my RO system seems milky or cloudy, what is the reason for this issue?

This is generally caused by trapped air within the RO system. However, it will not affect the quality of your water. The cloudiness should disappear within a minute after water sits in a glass. This is a normal occurrence with a newly installed RO System or after a filter change. You can release the air from your RO system by draining the tank 1 to 2 more times or using RO makes humming noise air release instructions in your system manual (see below). Read more

APEC RO System: Permeate Pump Replacement

To replace the Permeate Pump on your RO system, please follow steps below:

  1. Turn off the feed water to the RO system. Close the tank’s ball valve by turning the blue cap on the tank ball valve 90 degrees. Turn on the RO spigot, lift lever up & lock –> this relieves the pressure in the RO system, making it easier to remove the lines connected to the Permeate Pump. Read more

Saddle Feed Installation Instructions for 3/8″ Brass adapter

Before connecting your extender tee, close your supply stop and disconnect the water line to the faucet at the supply stop valve.
Attach the extender tee to your supply stop and re-connect faucet water line to the inline outlet.
Connect new supply line from your water appliance to the branch outlet of your new extender tee.


Your system is upgraded to “Quick-Connect” type fittings.  When Making Connections to these Quick-Connect Fittings, simply insert tubing directly into these fittings on the system.  Please Do Not Add “Tube Inserts” to these connections!

To Connect

  • Simple insert tubing all the way into the connecter or fitting.

Read more

Instructions on How to Insert Membrane

IMPORTANT!  Must Insert Membrane Into This Housing Before Use!

Insert Membrane This Direction:

  • Open housing’s cap: Remove the Red tubing from cap first, then open cap. Read more

How to Install IceMaker with Your Reverse Osmosis (R.O.)?

How to Connect APEC R.O. System to Your Ice-Maker, Coffee-Maker, or Second Faucet?

To connect the pure water from your RO system to your icemaker, coffee maker, or to a second faucet, you need to have:

  • One ¼” T-fitting, preferably the quick-connect type fitting (just push tubing into fitting, no inserts needed).
  • Extra ¼” tubing, long enough to go from your RO system to the icemaker, or to the destination of your 2nd water dispensing point. Read more

Air-Gap Faucet Hook-Up

There are 3 colored tubing on your Air-Gap faucet. At the end of each 1/4” tubing there is a “Quick Connect” fitting. The Quick Connect fitting is used to connect the Pure and Rinse water line from the RO unit to the Air Gap Faucet.

To connect the lines, simply insert each line into the fitting port tightly.


  1. Assemble the faucet: There is a plastic “filler tube” in the slot next to the faucet’s on/off black lever. Remove this filler-tube, and immediately insert the faucet spout into the slot to prevent the black lever from falling out of its socket. Do Not press down the black lever until the spout is inserted into the slot.  Read more

TDS Reading Is Higher Than Normal

If the Pure water TDS is higher than normal after 1-2 full tank flushes, please review the possible reasons below.

  • Membrane was not inserted > Put membrane into housing.
  • Membrane is inserted incorrectly > Re-insert membrane correctly. Refer to Manual.
  • Tap water source water has very high TDS and/or contains certain heavy dissolved elements resulting in TDS higher than usual. Read more

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