I have been using the Fauna Marin Sodium Bicarbonate for several years now on a dosing pump and am very happy with the results as you can keep you alk in the 7-7.5 dKh range and my pH is rock solid at 8.3 
 
I would recomend that if you have a high coral load in your tank you should test often, especially if you are trying to maintain your alk close to NSW (7 dKh). 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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