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SYMPTOM
Low permeate flow rate
(continued)
Low concentrate flow rate,
normal or higher than
normal pressure
Pressure does not drop when
concentrate valve opened
POSSIBLE CAUSES
Dirty or fouled membrane
elements
Operating on cold water less
than 55ºF (13ºC)
Membrane elements installed
backwards or damaged
concentrate seal
Flow meter inaccurate
Concentrate valve plugged
Concentrate outlet line restricted
Flow meter inaccurate
Dirty concentrate valve
REMEDIES
Flush and clean the membrane
elements.
Install a hot/cold feed water
tempering valve if more perme-
ate flow is needed. Operate
with a feed water temperature of
72º - 77ºF (22º - 25ºC).
Install membrane elements in
the direction of fluid flow.
Flush and clean the machine
immediately
. Membrane ele-
ments with damaged concentrate
seals should be cleaned and may
be returned for repair.
Check the flow rate manually
with a stopwatch and calibrated
container.
Remove the concentrate valve
stem and/or disassemble the
plumbing. Clean the valve.
Examine the concentrate line for
obstructions or kinks, repair or
replace the tubing.
Check the flow rate manually
with a calibrated container.
Disassemble and clean the
plumbing to the valve.
TROUBLESHOOTING GUIDE