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					Originally Posted by  frd72
					 
				 
				when i have my 33 g, i survive by using DI tap water filter good for few months use.. but if you are planning to get bigger invest on a used or new RO/DI units less hassle in the end..   
			
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 you never replace your membranes or media??
sems like you would need to consider that cost per month as well IMO...