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			#10  
			
			
			
			
			
		 
		
		
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			 If you keep your alk between 7 and 9, you need to keep your calcium at at LEAST 425ppm/Ca. This is because if you keep your alk and Ca in balance with each other, you pH should stay the same, or in the very least fluctuate less. 
		
	
		
		
		
		
		
	
		
		
	
	
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