The Eco Smart manual is available on line and it has a section on suggested placement of the pump for various tank shapes.  Naturally they suggest two - a master and a slave.  I am still waiting for my pumps so have no personal experience on placement but I expect someone else will chaime in with their placement and how they work.  Good luck! 
		
	
		
		
		
		
		
	
		
		
	
	
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