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Fouled hulls need vibrating action to remove barnacles, according to Wavecraft USA, manufacturer of Waveblade.

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The Waveblade is a submersible power tool that vibrates to remove marine growth without damaging the underlying surface or disturbing bottom paint. It uses 12-volt DC power, draws only 3.2 amps and can connect to a 110-volt AC converter. With a 45-foot power cord, the Waveblade is certified for underwater use to 15 feet. It retails for $399. Wavecraft USA,

January 2013 issue