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4.3 Flushing
The machine should be flushed at least daily to remove sediment from membrane element
surfaces. To flush the unit:
STEPS
1. Open the concentrate valve until the pressure gauge indicates the minimum pres-
sure designated on the nameplate. This increases the flushing action on the mem-
brane element.
NOTE: If pressure will not decrease to designated pressure, or if the concentrate
rate does not increase when the valve is opened, the valve may be
plugged.
2. Operate the machine at the designated minimum pressure for 10 to 20 minutes.
CAUTION
: Do not operate the machine below the designated pressure
without approval from GE Osmonics. Operation below the
stated pressure may be detrimental to the pump.
3. Close the concentrate valve and ensure that the proper concentrate flow rate is
going to the drain (see the nameplate on the panel).
NOTE
: The Autoflush (AUF) system, available in DLX packages, automati-
cally flushes the machine and eliminates the need for frequent manual
flushing.
4.4 Cleaning
Cleaning the E4H-Series machine on a regular basis is vital. Over time, contaminants
build up to form a layer on membrane element surfaces, reducing the permeate flow and
quality. If this build-up is not removed from the membrane element, it may cause perma-
nent chemical damage and reduce membrane element life. A decrease in permeate flow
and/or rejection of salts, or an increased pressure drop across the machine will indicate
when cleaning is required. Cleaning may be required as often as once every week or as
infrequently as every two months, depending upon the local water supply conditions.
GE Osmonics recommends cleaning at least every month to ensure good membrane ele-
ment performance and long membrane element life.
GE Osmonics offers a full line of chemical cleaners for specific cleaning needs. See
Table 4.4 (Dry Chemical Cleaners).
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