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A powerboater has a similar one in our marina, different, but the same idea. There is a "control unit" on the dock, similar to a dock box, which has an air compressor and you fill the black "pontoons" with air to get it out of the water and you can also fill it with water to lower it to the water. The first time I saw it I found it just a funny & curious, but it certainly works like a charm. I've seen guy use it a couple of time and of course, no growth at all on the hull. On a sailboat it certainly reduces the area that will get growth.
1982 Gib'Sea 105
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