(5) Check the TDS of the flushwater at the waste hose.
If the TDS is
above 1,500 ppm, repeat the flush procedures.
(6) Open the cartridge filter block valve and the cleaning bypass
e. Have the crew flush the polyelectrolyte and sequestrant tanks by
performing the following:
(1) Open the drain valves at both tanks. Disconnect one dispensing
hose from the distribution pump and connect the auxiliary fill hose to the
(2) Pass the hose through the doorway and connect the flushing
Connect the flush/purge hose to the flushing adapter.
distribution pump "off" pushbutton and turn the distribution pump selector
switch to "on". Open the valve on the flush/purge hose.
(3) Turn on the distribution pump and use the hose to flush out and
partially fill both tanks.
Then, turn off the distribution pump.
Disconnect the flush/purge hose from the flushing adapter.
(4) Turn on the chemical pump.
Set the polyelectrolyte pump speed
control to 80 and stroke to 100.
Flush for two to five minutes and then
stop the pump.
Repeat the procedures for the sequestrant pump, using the
sequestrant pump speed control and stroke control when adjusting speed and
(5) Be sure the hose valve is closed on the flush/purge
Connect the flush/purge hose to the utility air connection.
(6) Connect the flush/purge hose to the purge connection on the tank.
Open the hose valve and dry cut the chemical tubing for two minutes, then
close the valve. Repeat this step for the sequestrant tank and hypochlorite
tank. Disconnect and store the flush/purge hose.
f. Have the crew secure the equipment by performing the following:
(1) Open all of the drain valves, vent valves, and manual valves. Do
not open valves on the RO vessels.
This leaves the RO vessels full of
sodium bisulfite sanitizing solution. Drain only if subject to freezing.