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			#11  
			
			
			
			
			
		 
		
		
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			 I have a 4 head unit and only use two of them (Alk and Calc).  I intended to use the 3rd one for Mag but I never get much of a depletion from Mag.  It seems to replenish itself with the weekly water changes from my IO salt.  I find that a little strange but it is what it is. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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