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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.
  2. There are two plastic “C” clips that are provided with the UV light. Attach both clips onto the Stage-4 Carbon Filter, then clip on the UV light. See figure. 3
  3. The UV light comes with pre-installed tubing at Point B. Connect the other end of the tubing to Point K on the Stage 4 filter. Stage 4 filter is a quick connect fitting, you do not need any inserts, sleeves or nuts here, simply push the tubing into the fitting.
  4. There is spare tubing that is provided with the UV light.  Slide the plastic sleeve over the tubing, and then push in the plastic insert into the tubing.  Attach the tubing to Point A on the UV light. This is now your pure water output line.
  5. Connect the UV Transformer to the UV Bulb, and plug the UV transformer into a power socket.
  6. Pure water will now flow out of the UV light as the last stage.

Figure 1

Figure 2

Figure 3

If the issue was not addressed, please contact us at:
800-880-4808, or

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