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SYMPTOMS
LOW INLET PRESSURE
LOW PERMEATE FLOW
HIGH PERMEATE FLOW
POOR PERMEATE QUALITY
MEMBRANE FOULING
HRO 6
REVERSE OSMOSIS TROUBLESHOOTING
POSSIBLE CAUSES
Low supply pressure
Cartridge filters plugged
Solenoid valve malfunction
Concentrate valve might be
Cold feed water
Low operating pressure
Defective membrane brine seal/
Membrane installed backwards
Fouled or Scaled membrane
Damaged product tube o-rings
Damaged or oxidized membrane
Exceeding maximum feed water
Low operating pressure
Damage product tube o-rings
Damaged or oxidized membrane
Metal Oxide Fouling
Colloidal Fouling
Scaling (CaSO4, CaSO3,
Biological Fouling
Organic Fouling
Chlorine Oxidation
Abrasion of membrane by
Crystalline Material
damaged
Leaks
temperature
BaSO4, SiO2)
30
CORRECTIVE ACTION
Increase Inlet Pressure
Change Filters
Replace Sol. Valve and/or Coil
Replace Needle Valve
Fix any visible leaks
See temperature correction sheet
See low inlet pressure
Replace brine seal and / or
Reposition membranes
Clean membranes
Inspect and/or replace
Replace membrane
See temperature correction sheet
Adjust concentrate valve
Inspect and/or replace
Replace membrane
Improve pretreatment to remove
metals. Clean with Acid
Cleaners.
Optimize pretreatment for colloid
removal. Clean with high pH
anionic cleaners.
Increase acid addition and
antiscalant dosage for CaVO3
and CaCO4. Reduce recovery.
Clean with Acid Cleaners
Shock dosage of Sodium Bi-
Sulfate. Continuous feed of
Sodium Bi-Sulfate at reduced pH.
Chlorination and de-chlorination.
Replace cartridge filters.
Activated Carbon or other
pretreatment. Clean with high pH
cleaner.
Check Chlorine feed equipment
and de-chlorination system.
Improve pretreatment. Check all
filters for media leakage.
07/26/12
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