FNM HPE Series Owner's Manual page 76

3.3.3 Cleaning and inspection of sea water filters
Ordinary maintenance: made by the boat user and the workshop staff.
During the engine period of use check daily the sea water filter. The filter should allow the smooth
passage of water (100 liters/minute at 4000 RPM). Also check that the seawater intakes are clean
from elements that can block the passage of water.
Close the sea water intake valve when you dismount the filter.
For the filter cleaning:
1. Open the sea water intake cap after closing the valve.
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Figure 29 - Sea water filter
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FNM HPE Series