b. After backwash is completed, drain brine tank and set chemical feed control valves to prime. Place
the product water discharge hose into the brine water tank. Operate the ROWPU to produce nonchlorinated
product water (minimum 1,000 gallons).
When the tank is full or the minimum requirement is met, shut down the ROWPU (para. 2-31).
Remove the raw water strainer and hose from the source and place it in the tank of
NONCHLORINATED product water.
Follow INITIAL ADJUSTMENTS AND CHECKS (para. 2-23) and OPERATING PROCEDURE
(para. 2-25), except for moving the chemical feed valves to run (NO CHEMICALS SHOULD BE INJECTED INTO
THE SYSTEM DURING THIS PROCEDURE), until the nonchlorinated tank is empty.
Shut down the ROWPU following SHUTDOWN PROCEDURES (para. 231).
This procedure should be used to flush the salt deposits and bacteria from the system and the R.O.
elements. By flushing this from the system, it slows corrosion and bacterial growth.
NUCLEAR OR CHEMICAL CONTAMINATED AREAS
The ROWPU has overpack items which are used as a posttreatment when nuclear or chemical
contaminants are present. The equipment consists of a cartridge to remove nuclear contaminants, a cartridge
used to remove chemical contaminants, and the adapters, bushings, clamps, couplings, reducers, and tubing
needed for assembly.
Radioactive contaminants are potentially hazardous. Use extreme care in
replacing cartridges and follow safe procedures in their handling and disposal.
Do not operate chlorination feed pump during NBC operation.
b. For nuclear, biological OR chemical contamination, use BOTH the cartridge marked FOR USE
WITH RADIOACTIVE CONTAMINATED WATER ONLY AND the cartridge marked FOR USE WITH
CHEMICALLY CONTAMINATED WATER ONLY.
Exchange the inlet and outlet raw water pump adapter which is used in the NBC system and
prepare to assemble NBC filters between two raw water tanks as shown in figure 2-83.