Manual

29
MKTF - 211 07/26/12
REVERSE OSMOSIS TROUBLESHOOTING
SYMPTOMS POSSIBLE CAUSES CORRECTIVE ACTION
LOW INLET PRESSURE
Low supply pressure Increase Inlet Pressure
Cartridge filters plugged Change Filters
Solenoid valve malfunction Replace Sol. Valve and/or Coil
Concentrate valve might be
damaged Replace Needle Valve
Leaks Fix any visible leaks
LOW PERMEATE FLOW
Cold feed water See temperature correction sheet
Low operating pressure See low inlet pressure
Defective membrane brine seal/
Membrane installed backwards
Replace brine seal and / or
Reposition membranes
Fouled or Scaled membrane Clean membranes
Damaged product tube o-rings Inspect and/or replace
HIGH PERMEATE FLOW
Damaged or oxidized membrane Replace membrane
Exceeding maximum feed water
temperature
See temperature correction sheet
Low operating pressure Adjust concentrate valve
POOR PERMEATE QUALITY
Damage product tube o-rings Inspect and/or replace
Damaged or oxidized membrane Replace membrane
Metal Oxide Fouling
Improve pretreatment to remove
metals. Clean with Acid
Cleaners.
MEMBRANE FOULING
Colloidal Fouling
Optimize pretreatment for colloid
removal. Clean with high pH
anionic cleaners.
Scaling (CaSO4, CaSO3,
BaSO4, SiO2)
Increase acid addition and
antiscalant dosage for CaVO3
and CaCO4. Reduce recovery.
Clean with Acid Cleaners
Biological Fouling
Shock dosage of Sodium Bi-
Sulfate. Continuous feed of
Sodium Bi-Sulfate at reduced pH.
Chlorination and de-chlorination.
Replace cartridge filters.
Organic Fouling
Activated Carbon or other
pretreatment. Clean with high pH
cleaner.
Chlorine Oxidation
Check Chlorine feed equipment
and de-chlorination system.
Abrasion of membrane by
Crystalline Material
Improve pretreatment. Check all
filters for media leakage.