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			 More precisely, you need to choose buffer solutions that bracket your target pH. Salt water is ~ pH 8.2 so you'd choose pH 7 and pH 10 as your buffers. Your calcium reactor has ~ pH 6.5 I think and that would be pH 4.01 and 7 buffers. 
		
	
		
		
		
		
		
	
		
		
	
	
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