TM 10-4610-310-14
OPERATOR MAINTENANCE
LIGHTWEIGHT WATER PURIFIER
ULTRAFILTRATION MEMBRANE CHEMICAL CLEANING
INITIAL SETUP
Materials/Parts
Special Environmental Conditions
M334, (item 15, WP 0136 00)
Do not allow drainage to be contaminated
M331, (item 16, WP 0136 00)
Acid, Citric (item 1, WP 0136 00)
Equipment Status
LWP set up for normal operations
Tools
Water in product tank is needed
Paddle, stirring, (PN 3485K14)
Pail, utility, 5-quart, (NSN 7240-00-061-1163)
Immersion heater, 2000-watt, (PN 2850332001)
Stop watch (table 2, item 49, WP 0135 00)
Chlorine Test Strip (481126-50)
Ultrameter (table 2, item 30, WP 0135 00)
GENERAL
This work package contains information and instructions to chemically clean the three ultrafiltration (UF)
membranes in the UF module used in the Lightweight Water Purifier (LWP). The UF module will be chemically
cleaned when the UF differential pressure exceeds 30 psi.
The cleaning may consist of up to three chemicals, each followed by a clean water rinse. The chemicals are
M334, M331, and citric acid.
CHEMICAL CLEANING PROCEDURE
CAUTION
To avoid damage to the LWP, make sure cleaning tank is clean and free of dirt, trash, and
debris before starting.
1. Release the two latches on cleaning tank. Lift up cover. Use gray sampling hose to fill the cleaning
tank to the bottom of the cleaning tank inlet. Open 3-way Valve to fill. See Figure 1.
CLEANING TANK INLET
3-WAY VALVE
CLEANING
TANK
SAMPLING
HOSE
PRODUCT WATER INLET
Figure 1. Filling Cleaning Tank.
