While flushing, partially open the media filter lower drain valve (9).
Check the TDS of the flushwater.
Remove the waste out hose (32) from the ROWPU Van waste out connection.
Sample the water draining from the waste out connection on the ROWPU Van.
Measure the TDS of the flushwater using the Portable TDS meter (para. 2-7).
Reconnect the waste out hose (32).
If the TDS is 1000 ppm or less, continue with step (12). If the TDS is above 1000 ppm, repeat steps (1) through (11).
This procedure assures all seawater/brackish water has been flushed from the media filter
and piping system.
Open the cartridge filter block valve (5) and the cleaning bypass valve (4).
RO element cleaning.
Clean according to procedures of Table 2-28 or 2-29.
Continue with bisulfite sanitizing cleaning (para. 2-26).
Flush chemical tanks (see Figure 2-54).
Open drain valves (10) at both tanks.
Disconnect one dispensing hose (11) from distribution pump (12); connect auxiliary fill hose (13) to pump.
Pass hose through doorway and connect water flush adapter (14).
Connect flush/purge hose (15) to water flush adapter (14). Push DISTRIBUTION PUMP OFF (17) pushbutton and turn
distribution pump selector switch to ON. Slowly open valve on "flush/purge" hose to prevent blowing the lines.
Selector switch on distribution pump must be in ON position in order to control the pump
from the start/stop station inside the secondary access door.
Push DISTRIBUTION PUMP ON (16) and use hose to flush out both tanks and to partially fill, then push DISTRIBUTION
PUMP OFF (17).
Disconnect flush/purge hose (18) from water flush adapter (14).
Press CHEMICAL PUMP START (19).
CHEMICAL PUMP START light (20) on panel should glow green.
Set polyelectrolyte pump speed control (21) to 80 and stroke control (22) to 100.
Flush for two to five minutes and press CHEMICAL PUMP STOP (23). Light (20) should go off.
Repeat procedures (1 thru 10) for sequestrant pump, using sequestrant pump speed control (21) and stroke control (22)
when adjusting speed and stroke.
Be sure hose valve (24) is closed on flush/purge hose (15).
Connect flush/purge hose (15) to the utility air connection (25).
Connect flush/purge hose to the quick-disconnect (26) on the tank.
Open hose valve (24) and dry out chemical tubing for 2 minutes. Close valve.
Repeat steps 2 and 3 for sequestrant tank.
Change 12 2-103