i see air bubbles in the water from my apec ro faucet, is my system broken?

Diagnosis

In the vast majority of cases with the APEC ROES-50, "milky" or "cloudy" water is not a sign of a mechanical failure, but rather a phenomenon called aeration. When you replace the three pre-filters or the RO membrane, air becomes trapped within the filter housings and the permeate line. Because the ROES-50 utilizes a pressurized storage tank, this air is compressed into the water. When you open the faucet, the sudden drop in pressure causes these microscopic air bubbles to rapidly expand and release, creating a white, cloudy appearance that looks like soap or milk. You can confirm this is air and not a chemical contaminant or a leak by performing the "Glass Test." Fill a clear glass with the cloudy water and set it on a counter. If the cloudiness clears from the bottom up over the course of 30 to 60 seconds, it is definitively dissolved air. If the water remains cloudy or develops a sediment layer at the bottom, you may have a fractured membrane or a failing carbon post-filter. This is especially common after a system "prime" or when the storage tank has been completely drained and refilled.

How to Fix It

To properly purge the air from your ROES-50 system and clear the cloudiness, follow this systematic flushing sequence:

1. Open the RO faucet fully and allow the water to run for 3 to 5 continuous minutes. Do not use a glass; let it flow directly into the drain to ensure maximum velocity.
2. Close the faucet and allow the storage tank to refill completely. You can monitor this by checking the pressure gauge on the tank (if installed) or waiting until the system stops producing waste water through the drain line.
3. Repeat the flushing process: open the faucet and run the water until the flow slows down to a trickle. This forces the air pockets out of the membrane housing and the final polishing filter.
4. Perform a "Tank Purge." Close the valve on top of the storage tank and run the faucet until the water stops flowing. Then, open the tank valve and run the water again. This creates a pressure differential that helps push trapped air through the lines.
5. If you recently replaced the filters, repeat this cycle three times over a 24-hour period to ensure all microscopic bubbles are expelled from the filter media.

If That Didn't Work

• Check for "Air Leaks" in the suction side. If you see constant, streaming bubbles rather than a cloudy mist, check the push-to-connect fittings on the pre-filter housings. If a fitting is slightly loose, it can suck air into the stream. Push the tubing firmly into the fitting or trim 1/4 inch off the end of the tubing with a square cut and re-insert it.
• Inspect the Post-Carbon Filter. If the cloudiness persists only after a new post-filter installation, the filter may have a manufacturing defect causing "fines" (carbon dust) to leak into the water. Replace the post-filter with a different unit to see if the clarity improves.
• Verify Tank Pressure. Use a tire pressure gauge on the storage tank's Schrader valve (located under the plastic cap). If the air pressure is too high (above 10-12 psi when empty), it can force excessive air into the water line. Discharge the excess air using a small bleed valve.
• Examine the Membrane Seal. If you recently replaced the RO membrane, ensure the O-rings are seated perfectly in the housing. A pinched O-ring can allow air or unfiltered water to bypass the membrane, causing turbulence and bubbling.

Heads Up

• Avoid using Teflon tape on the plastic threaded housings of the ROES-50; these rely on rubber O-rings for sealing. Tape can actually prevent a tight seal and introduce air leaks.
• Always sanitize your system with a diluted bleach solution or a commercial RO sanitizer when replacing the membrane to prevent biofilm buildup that can mimic cloudiness.
• Remember that the first two full tanks of water after any filter change should be discarded and not used for drinking to clear out carbon fines and preservatives.
• Check your source water pressure; if your home pressure is below 40 PSI, the ROES-50 may struggle to purge air efficiently, and you may need a permeate pump or booster pump.