ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
0020 00
OPERATOR INSTRUCTIONS
CLEANING, PRESERVATION, AND CLEANING WASTE
NEUTRALIZATION AND PUMP-OUT
AC-310 detergent is used without the caustic for RO detergent cleaning. (Use of caustic for this cleaning
will destroy the RO membranes.) RO Detergent Cleaning procedures are described in WP 0023, RO
System Detergent Cleaning. If the RO %Clean is less than 60% when first operating after a long
shutdown period, extend the detergent cleaning time to 4 hours to try to restore the RO elements. They
are probably severely fouled due to improper preservation.
MF CLEANING WITH RO ACID CLEANING
MF Cleaning with RO Acid Cleaning is performed whenever the TWPS is placed in a long-term term shut-
down in preparation for storage. It should also be performed if the TWPS is to be shut down during
deployment for longer than 54 hours and it is not certain how long the TWPS will be shut down before it is
started up again. Cleaning in preparation for storage is performed regardless of the TMP, RO % Clean,
and RO % Salt Rejection values. The purpose of cleaning in preparation for storage is to preserve and
extend the useful life of the MF modules and RO elements.
MF cleaning with RO acid cleaning combines the MF cleaning and RO acid cleaning procedures in the
following order:
- MF Backwash (with product water)
- Acid Cleaning Solution Preparation
- MF Drain
- RO Acid Cleaning
- MF Acid Cleaning
- MF Caustic Detergent Cleaning
The MF Cleaning with RO Acid Cleaning procedures are described in WP 0024, MF System Cleaning and
RO System Acid Cleaning.
RO PRESERVATION
The purpose of RO preservation is to prevent biological growth on the RO element membranes when the
TWPS is not being used. If the RO membranes are not preserved, biological growth will clog the
membranes and the TWPS will not meet performance requirements when it is placed back in service.
RO preservation is performed for an extended shut-down during deployment (shut-down greater than 54
hours) and at the end of deployment in preparation for long term storage. The RO membranes are
preserved with AC-120 sodium bisulfite.
RO preservation for an extended shut-down during deployment involves flushing the RO membranes
once with the bisulfite solution.
RO preservation in preparation for long term storage is performed after the MF Cleaning and RO Acid
Cleaning procedures are performed. RO preservation involves recirculation of the bisulfite solution
through the RO for an hour, then draining the RO system.
The RO Preservation procedures are described in WP 0025, RO System Preservation.
0020 00-3
