RO System FAQ

Ultra Filtration

Generally, problems of a RO system can be divided into 3 categories: pressure, flow and salt rejection. The following lists of questions help to identify possible causes for these problems.


Pressure
Q. Why operating pressure is low?
Answer:
Possible causes
  • Insufficient feed water pressure or flow
  • Pre-filter clogged
  • Solenoid valve not open
  • Pump rotating backwards
  • Insufficient power supply
Answer:
Possible causes
  • Concentrate or recycle valve plugged
  • Membrane fouled
  • -Membrane install backward
  • Feed water throttling valve closed or restricted flow
Answer:
Possible causes
  • Restricted flow after pump discharge
  • Membrane severely fouled
Flow
Q. Why permeate flow is low?
Answer:
Possible causes
  • Low operating pressure
  • Membrane fouled
  • Operating on cold water
  • Flow meter inaccurate
  • RO system was shut down without flushing
  • Pre-filter clogged
Answer:
Possible causes
  • Concentrate valve plugged
  • Concentrate pipeline restricted
  • Membrane damaged or rupture
Answer:
Possible causes
  • Inlet solenoid valve not, closing or seating properly
Salt Rejection
Q. Why permeate conductivity reading is high?
Answer:
Possible causes
  • Membrane fouled
  • Membrane seal o-ring broken or damaged
  • Raw water quality changed
  • Membrane exposed to chlorine or other strong oxidant
  • Fouled probe or inaccurate conductivity monitor
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