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SYMPTOM
High operating pressure
Water flowing when
machine is turned OFF
Declining rejection (high
permeate conductivity)
POSSIBLE CAUSES
Recycle or concentrate valve
plugged
Inaccurate pressure gauge
Restricted flow after pump
outlet
Telescoped membrane ele-
ment covering membrane ele-
ment housing outlet port
Inlet solenoid valve not clos-
ing or seating properly
Severely fouled or dirty
membrane elements
Dirty or fouled membrane
elements
REMEDIES
Disassemble the plumbing
to the recycle valve and
remove foreign particles.
Check the concentrate
valve stem.
Replace or calibrate the
gauge as required.
Check for blockage of the
concentrate flow at the
inlets and outlets of the
membrane element
housings.
Ensure that the anti-tele-
scoping device (ATD) is
located properly on the
membrane elements.
Clean or replace the valve.
Clean the membrane ele-
ments with detergent
immediately
. Water must
not pass through the inlet
when the machine is OFF.
Flush and clean the mem-
brane elements.
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TROUBLESHOOTING