30
- Stages 1, 2, 3 pre-filters partially clogged, reducing the input water pressure in RO —> Check stage-1
filter to see if it’s very dirty. If this filter has turned brown or other color in just 1-3 months, that means
your input water has very heavy sediments and other clogging agents. Need to replace stage-1 filter
frequently.
- RO busy feeding multiple output points —> If your RO feeds multiple outlets (icemaker,
bathroom, aquarium), the waste water will run as long as the RO is making water to fill the tank and
other output points. In this case, it’s normal to hear waste water running.
5) System Does Not Shut-Off: Waste water runs all day - and Never Stops
- Input pressure way too low (below 30psi). Not enough pressure to shut off the RO at all —> Check in-
put water pressure. If pressure is below 30psi, need switch to Booster-Pumped RO model. Contact APEC
customer service for assistance.
- One of the shut-off valves are defective, so RO cannot shut off —> Do a shut-off test to determine
which valve is defective. Do test as shown below.
6) How to Test RO’s Shut-Off Function:
The RO system should shut off automatically when the tank is filled. When the RO fails to shut off after
tank is filled, the waste water will keep running down the drain, depleting the pre-filters and membrane.
See Fig. 16. The Auto-Shut-Off (ASO) valve is located at point C. The Check Valve is located at
point E. These two valves control the RO’s shut off function.
If one of these valves fail (valve worn out, clogged, or defective), the system cannot shut off, and the
waste water fill keep running non-stop.
Do test #1 and #2 below to determine if the RO can shut off, and if the valves are OK.
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