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					Originally Posted by  Bryan
					 
				 
				I did not think it was allowable for a company to market and sell a algae scrubber because the design was patented. That's why you will not see one marketed and sold in North America, but I guess overseas anything goes. 
			
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 I remember reading that his patent was expiring soon or already had. Don't quote me on it I just remember reading that in passing.