Secondary effects of hull cathodic protection...

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Greetings.
Galvanic hull protection works well. What is its electrical effect in the attachment of algae and barnacles biofouling ? Does it prevent, favors or there is no effect in their attachment ? -In fresh and in seawater-

I know for sure significant electrical currents destroy marine microorganisms in a couple of seconds. But for the weak galvanic currents I do not know.
 

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