3030226 Rev. D 6-8 Troubleshooting
6.10 Product Flow Too Low
Low water temperatures, fouled membrane elements, or inadequate pump pressure
can cause low product flow. A partial blockage of the RO feed stream (dirty pre-filter)
can also result in low product water flow by causing the pump to draw a strong vacuum.
Similarly, an obstruction (such as a defective check valve) in the product flow path may
cause reduced flow.
1. Low RO feed water temperature.
a. Verify product production with Technote 113, “Temperature Correction”.
b. Install or adjust temperature blending valve.
2. Membrane fouled or scaled.
a. Review trend analysis logs.
b. Clean membrane with low and or high pH cleaners.
c. If flow is not recoverable, replace membrane.
3. Check softener pretreatment for brackish (high salt) water.
a. Check inlet water for high conductivity.
b. Check water softener for proper function.
c. Regenerate softener.
d. Check supply water for hardness and conductivity.
4. RO Feed water fouling membrane (change in RO feed water).
a. Check for change in RO feed water quality.
b. Check with city water department.
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