if you are in salt or brackish, the growth on the bottom of your boat has to be controlled by bottom paint( has biocides adn is ablative for the growth to fall off). Fresh water isn't as bad, but it still grow on it if left alone long enough. Down here, in the summer time, even with good paint, the divers clean the hulls every three weeks to keep a boat ready for use, go one or two weeks too long, and it won't even get on plane.
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