TM 10-4610-241-10
TO 40W4-13-41
2-12. R.O. ELEMENT CLEANING METHODS-cont.
c.
When R.O. PRESSURE PSI gage (16, figure 2-5) indicates 960 psi and PRODUCT WATER FLOW gage
(20) indicates less than 6 gpm (salt water).
d.
When R.O. PRESSURE PSI gage (16) indicates 500 psi and PRODUCT WATER FLOW gage (20) indicates
less than 10 gpm (fresh/brackish water).
2-13. R.O. ELEMENT CLEANING PROCEDURE.
a.
Citric Acid Method
(1)
Perform multimedia filter backwash (para. 2-10).
WARNING
Be sure that the drained brine water runs toward lower ground at least 25 yards downstream of raw water
intake.
NOTE
To correctly mix citric acid, water level in backwash tank must be lowered to a depth of seven inches.
(2)
Disconnect backwash water inlet hose from control panel and place down stream at least 25 yards
from raw water inlet ( figure 2-67).
(3)
Open brine tank gate valve.
WARNING
To prevent injury to personnel and damage to equipment, hold end of backwash water hose during
pumping operations.
(4)
Push ELEMENT CLEANING switch (24, figure 2-5) up to START.
(5)
Using telescopic aluminum paddle, measure water level in backwash tank (figure 2-68). When water
level is seven inches in backwash tank, set ELEMENT CLEANING switch (24, figure 2-5) to OFF.
(6)
Close brine tank gate valve (figure 2-67).
2-109
