SpectraPure
®
SpectraPure
®
Inc.
480.894.5437 Call us toll-free 1.800.685.2783
2167 East Fifth St, Tempe, Arizona 85281
16
Membrane Troubleshooting Guide
The following chart illustrates the procedure for determination of RO membrane
performance. However, the chart represents only rough guidelines for determining
performance of RO membrane. Depending on your tap water chemistry, the
rejection characteristics of the membrane may vary significantly.
Method of
Testing
Calculate % Rejection
Test Results
Conclusion
TDS/
Conductivity
Tester
Measure feed water and
RO product water TDS/
Conductivity
Is Rejection
greater than
95%?
No - Replace Membrane
Yes - Membrane OK
Alkalinity
Test Kit
Measure feed water
and RO product water
Alkalinity
Is Rejection
greater than
90%?
No - Replace Membrane
Yes - Membrane OK
Hardness
Test Kit**
Measure feed water and
RO product water
Hardness
Is Rejection
greater than
90%?
No - Replace Membrane
Yes - Membrane OK
**Caution: This test is not to be used on softened water sources.
TEMPERATURE EXTREMES:
1. The unit must be kept out of areas that are subject to freezing temperatures.
2. High temperatures greater than 113° F (45° C) must be avoided. If the
unit is used outside, avoid putting the system in direct sunlight or
connecting it to a garden hose that may be exposed to sunlight.
