On the top of the purifier, where is displacement water hose is connected, should be non-return valve.
If you have no NR valve better to install it (see spare parts book for purifier).
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"2) Verify that the "Oily water interface Log" Log is maintained with respect to consumption figures. Has anybody the slightest idea of what they are talking about? " I think this requirement is related to fuel oil consumption. The amount of sludge, which accumulated on board of ...