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					Originally Posted by  reefwars
					 
				 
				Fwiw calcium and Alk have no effect on each other although its common to her that they do , adding Alk will not lower or raise calcium and vice versa they are completely independent of themselves and one don't change the others number and technically can't   
I agree if your using kalk as a ph boost then sodium carbonate would be a Fine choice as well   
			
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 You are right there is not a direct relationship that adding one will automatically drop the other. I looked into this further. I was misinformed.