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What to Do When Permeate Pump is Not Clicking

When operating properly, the Permeate Pump will click once every 2-4 seconds. When the pump clicks, it is forcing the pure water into the tank and forcing the brine water into the drain. If your system is no longer filling the tank, or you no longer hear the pump clicking, you may have clogged filters or a defective permeate pump.

The instructions will guide you in determining if the pump is defective.  Please use the the diagram for reference.

  • Turn off the feed water line to the RO unit, by shutting off the needle valve or main water line.
  • Close off the tank by turning the blue cap on the tank ball valve 90 degrees. Read more

Tank is not filling on RO-45 or RO-90

If the tank is not filling on your RO-45 or RO-90, clogged filters or components can be the factor. Please follow the flow rate test below:

Test # 1

  • Turn off the feed water line to the system.
  • Grab an empty bucket or container to catch the water coming out from the tubing.
  • Disconnect the Red Tubing at Point D. Read more

RO System Runs for a Long Time, but Will Eventually Shut Off

The most common cause for slow-shut-off is insufficient input water pressure. RO needs sufficient input pressure to shut off promptly.  If the Ro system runs for an excessive amount of time (6-7) hours, but will eventually shut down, please review the possible factors below.

  • Input water pressure is too low (below 40psi). Not enough pressure to shut off RO promptly > Check input water pressure. If pressure is low, boost house pressure or add pump to RO. Please contact an APEC Representative for support. Read more

RO Unit Makes Humming or Vibrating Noise

If you are experiencing a humming or vibrating noise with your RO (reverse osmosis) system, there may be air bubbles that have accumulated inside the unit or Check Valve.

Please follow the steps below to purge the air bubbles out the unit: Please refer to Figure 1.

  • Close the tank’s ball valve, by turning the blue cap 90 degrees.
  • Tilt the RO system to the right. Put something under the 3rd filter housing to keep RO tilted. This helps dislodge the air bubbles from the Check Valve. Read more

Bad Taste To RO Pure Water

If you are experiencing a bad taste in the Pure Water, the RO Membrane or Stage 5 Carbon filter maybe depleted and needs to be replaced. Please follow the steps below to determine if the membrane and or stage 5 carbon filter 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

Booster Pump System Not Filling Up Tank

If the Booster Pump system is not filling up the tank, the Filters may be clogged or the Pump ESO (electronic shutoff valve) may be faulty. Please follow the steps below to determine what may be clogged on the booster pump unit.  

Please follow these steps: 

  • Shutoff the feed water to the RO unit.
  • Turn off the tank ball valve by turning the blue cap 90 degrees on the tank ball valve. Read more

Troubleshooting Guide for Leaking Standard Chrome Faucet

A leaking faucet is caused by 3 factors:

  1. Missing or Damaged spigot O-Rings.
  2. A loose or over-tighten faucet lever adjustment nut.
  3. A leaking or loose main shut off valve assembly.

Instructions: Read more

What to Do When There is No Water At Dispensing RO Faucet

If there is no water dispensing from the RO faucet after the unit is installed, please review the possible factors below.

  • Water supply is off > Turn on water by opening the RO Needle Valve, or make sure the main water line or valve is open.
  • Tank’s valve is closed > Turn tank valve to an Open position. Make sure the Blue handle on tank ball valve is Parallel to tubing connected to it. Read more

What to Do When Filter Housing is Leaking?

If you are experiencing a leak with any of the Pre Filter housings on the Reverse Osmosis System, the Rubber O Ring maybe defective. The filter housing must have an O Ring in order to seal properly. Please review the steps below to address a leaking filter housing.

Please follow the steps below:

  • Shut off the feed water line to the RO unit. Turn off the tank ball valve, by turning the Blue Cap on the tank ball valve 90 degrees.
  • Unscrew the filter housing that is leaking. Read more

Chrome Feed Water Adapter is Too Big to Install

The APEC RO unit comes standard with a 1/2″ Chrome Feed Water Adapter. Most under-sink pipe size is 1/2″, but some may be a special 3/8” size. If the supplied 1/2″ feed water adapter is too big, you may need to use a 3/8″ feed water adapter.

If you are not able to find this component at your local hardware store, please contact an APEC Representative to obtain the 3/8″ feed water adapter.

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

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