TM 10-4610-239-10
TM 08580B-10/1
g.
Set CITRIC ACID PUMP valve to PRIME. Feed is completed.
2-28.
R.O. ELEMENT CLEANING METHODS. It will be necessary to clean the R.O. elements to improve total
dissolved solids (TDS) rejection, and reduce operating pressure (P.S.I.). Two methods of cleaning elements are available.
One method, used most often, is to feed citric acid solution through the vessels (para. 2-29a). The second method is to
circulate Triton X-100 soapy cleaning solution through the vessels (para. 2-29b). Triton X-100 is more effective for
removing dirt and silt. The R.O. elements must be cleaned:
a.
Whenever the pressure shown on R.O. PRESSURE P.S.I. indicator rises to above 960 for seawater or 500
for fresh water.
b.
Product water output drops several gallons per minute on PRODUCT WATER FLOW indicator, with no
change in raw water temperature.
c.
BRINE FLOW increases noticeably, and the adjustment of REGULATE PRODUCT FLOW valve does not
correct the BRINE FLOW indication.
d.
When R.O. vessels pressure increases by 20% over initial reading.
2-29.
R.O. ELEMENT CLEANING PROCEDURE
a.
Citric Acid Method.
CAUTION
R.O. ELEMENT CLEANING switch (fig. 2-47) must be in OFF position
except while cleaning R.O. elements.
(1)
First backwash multimedia filter (see para. 2-26).
WARNING
Be sure that the drained brine water runs toward lower ground as far
downstream from the raw water source as possible.
2-79
