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			 Are you looking for an electronic auto topoff that turns on a pump or a gravity fed system? 
		
	
		
		
		
		
		
	
		
		
	
	
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			#2  
			
			
			
			
			
		 
		
		
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			 I use a gravity fed system that consists of a 5 gal pail and a humidifer float valve from Rona. Similar to this: http://www2.hawaii.edu/~delbeek/topoff.html 
		
	
		
		
		
		
		
	
		
		
	
	
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