Most boat owners do not realize that it is not legal to clean algae off a boat hull in the water without environmental controls. The issues are that the algae or slimy green stuff, is void of oxygen and when you clean it, even without soaps, you would release it into the water, this depletes the oxygen in the water.
The Coastal Commissions and EPA protect our waterways. The Federal Clean Water Act is specific about not allowing pollution into the waterways of the United States and that includes; ditches, streams, rivers, lakes, oceans and even storm drains.
The trick is to clean it, let it float on top of the water within a floating barrier, then use a wet-dry industrial shop vacuum to remove it. The algae or slimy green stuff will not hurt anything but the EPA does not want it discharged into the water. Once the boat is more buoyant and lighter, much of the "below the waterline" will show up, making it easy to pressure wash and brush with a firm, but soft-bristle brush, allowing you to clean it in the water and get the rest by snorkel.
Some believe that since the slimy green stuff is organic that it is okay to detach it from the boat into the water, not so. It needs to be collected, if possible you should clean the boat hull on dry dock and collect the wash water affluent for treatment. Additionally, you can read this article for more information on this complex issue:
http://ezinearticles.com/?Water-Volume-Usage-in-Boat-Hull-Cleaning&id=70696
L. Winslow is an Economic Advisor to the Online Think Tank, a Futurist and retired entrepreneur http://www.worldthinktank.net His company has been in the boat cleaning business for years: http://www.carwashguys.com/boatlaunch.shtml
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