TM 10-4610-232-12
2-25. RO ELEMENT CLEANING. Proper cleaning of the RO elements is critical to meet mission demands. Read and, as required,
perform the cleaning procedures in this section to keep the ROWPU running efficiently. System clean will require 2000 gallons (7570 I)
of potable water.
a.
General. The sequence of procedures for cleaning are summarized in Tables 2-29 and 2-30.
Table 2-29. Cleaning Procedures When Operating With Polyelectrolyte
Procedure
Ref.
NOTE
Do not repeat backwashing (Step 1) when already completed as a part of shutdown
procedures.
1. Backwash media filter (do not forward flush).
2-21 b, c
2. Replace cartridge filters.
2-24b (4)
3. Clean basket strainer(s).
2-24b (3)
4. Preliminary flush.
2-25b
5. Set-up to clean.
2-25c(1)
6. Citric acid clean.
2-25c(2), (3)
7. Flush RO elements two additional times.
2-25d(1)
8. Heat up to 80F but not over one hour.
2-25d(2)
9. Set-up to clean.
2-25d(3)
10. Detergent clean.
2-25d(4), (5)
11. Return to normal operation.
2-25d(6)
or
12. Continue with bisulfite sanitizing cleaning for shutdown to secured status.
2-26
Table 2-30. Cleaning Procedures When Operating Without Polyelectrolyte
Procedure
Ref.
NOTE
Do not repeat backwashing (Step 1) when already completed as a part of shutdown
procedures.
1. Backwash media filter (do not forward flush).
2-21 b, c
2. Replace cartridge filters.
2-24b(4)
3. Clean basket strainer(s).
2-24b(3)
4. Preliminary flush.
2-25b
5. Set-up to clean.
2-25e(1)
6. NTP-A clean.
2-25e(2), (3)
7. At 25, 50 and 75 hour intervals return to normal operation unless preparing for
2-25e(4)
shutdown to long term secured status.
or
8. At 100 hour intervals or for shutdown to long term secured status, continue with detergent cleaning,
9. Flush RO elements two additional times.
2-25d(1)
10. Heat up to 80F but not over one hour.
2-25d(2)
Change 12 2-113
