SpectraPure
®
Inc
.
Fax 480.894.6109 Fax us toll-free 1.877.527.7873
E-mail: [email protected] Visit us on the web www.spectrapure.com
17
SpectraPure
®
TROUBLESHOOTING GUIDE:
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 (X)
RO product water (Y)
for TDS/ Conductivity
Is Rejection
greater than
95%?
No - Replace Membrane
Yes - Membrane OK
Alkalinity
Test Kit
Measure feed water (X)
RO product water (Y)
for Alkalinity
Is Rejection
greater than
90%?
No - Replace Membrane
Yes - Membrane OK
Hardness
Test Kit**
Measure feed water (X)
RO product water (Y)
for Hardness
Is Rejection
greater than
90%?
No - Replace Membrane
Yes - Membrane OK
**Caution: This test is not to be used on softened water sources.
Product Water - Low Production Rate
Cause
Corrective Action
Plugged prefilters
Replace prefilters
Low water temperature
Heat feed water or use higher GPD membrane
Low feed pressure
Use booster pump or use higher GPD membrane
Fouled membrane
Replace membrane
