Aquatec DC 500, User Manual, Page: 6 / 25

6
Switch off the system
1) Open the pressure control valve until the plant runs without pressure.
2) Run the Aquatec several minutes to remove the concentrated salt from the
membranes.
3) Turn three-way valve (2) to position test-outlet.
4) Switch off the high-pressure pump first and then the feed pump.
5) Close the seawater intake valve.
6) Rinse with chlorine-free fresh water.
A fresh water flushing of the Aquatec is recommended after each operation. It avoids
biological growth in the membrane and preserves the life span and the reliability of
the entire system.
Fresh water flushing procedure
After each operation, the Aquatec should be rinsed with chlorine-free fresh water.
About 8 liters fresh water is needed per membrane. After fresh water flushing, the
system may remain unused for 6 days. This process can be repeated every 6 days.
Note: Prior to a longer period of shutdown (without flushing), the Aquatec has to be
preserved with the chemical no. 3 (Biocide). For instructions, see “Long term
preservation (mothballing) of the plant”.
Instructions for fresh water flushing. Working pressure 0 bar!!!
1) Close the seawater intake valve.
2) Open the pressure control valve entirely, turn the product water three-way valve
(2) to test-outlet position.
3) Turn three-way valve (4) according to the flow diagram of fresh water flushing.
Open valve (3). The fresh water pressure pump of the boat should turn on now.
Hint: Please find out the required amount of flushing water by discharging the
rinsing water into a bucket once after a normal operation (take off the hose at the
thru-hull fitting) and check the salinity constantly by tasting. During the process,
stop the time to find out the time requirement of future flushes. By collecting it in a
bucket, you also find out the needed amount of flushing water.
5) Close valve (3).