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Bad Taste To RO-CTOP Pure Water

If you are experiencing a bad taste in the Pure Water, the RO Membrane or Stage 2 or 4 Carbon filter may be depleted and needs to be replaced. Please follow the steps below to determine if the membrane or stages 2 and 4 carbon filters needs to be replaced.

  • Fill up a clean cup of water from the RO Unit.
  • Take a Pure Water TDS reading with the supplied TDS Digital Meter that came with the RO unit. Read more

APEC RO-CTOP System: Faucet Adaptor Kit Replacement

To replace the faucet adaptor on your RO-CTOP system, please follow the instructions below:

  1. Remove faucet adaptor:  Unscrew and remove the feed water Faucet Adaptor from your faucet.
  2. Remove double-flex line from Stage-1 filter:  See Figure A below. Read more


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

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

RO-CTOP-PH / RO-CTOP-PHC System Filter Change Instruction

RO-CTOP-PH / RO-CTOP-PHC System Filter Change Instruction

DIY: How to Add UV-Light To RO-CTOP (at last stage)

Please add the UV light to the RO-CTOP’s last stage as follows:

  1. Cut the 2 plastic straps on the unit. Remove the pure water output line at Point K. (soft line at the OUT end of the 4th stage filter,). See figure 1 & 2.
    • You must remove the red clip before disconnecting the tubing. Use a flat head screw driver to push in and hold down the Collet ring while pulling out the pure water line. Read more

DIY: How to Add an UV Light to Countertop RO System as Stage-0

  1. Remove the feed water line from the Stage-1 filter by disconnecting the gray fitting elbow Point A connector at the stage 1 filter.  To remove the gray fitting, simply press in and hold down on the “Gray” Collet ring at the base of the gray plastic fitting.  Then pull to disconnect the gray elbow from the filter tubing.  See figure.1
  2. Remove the short Red tubing from Stage-1 filter.
  3. Cut the 2 Plastic straps on the RO system. Read more

ROES-UV75 System Filter Change Instruction

ROES-UV75 System Filter Change Instruction

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