During service the ship will experience an increase in hull fouling dependent on the operational conditions. Factors which influence the increase in fouling:
-Length of port stay
-Service speed at sea
-Sea water nature, i.e. salinity, temperature, pH, salts and oxygen concentration
The ship also experiences different grades of fouling on different parts of the hull. Those parts of the hull exposed to light (usually the sides of the hull) are more exposed to fouling. Finally, the treatment of the hull in between dry-docking periods has importance. Polishing of the propeller and underwater cleaning of the hull will remove the fouling on these parts.