I would break it down into thirds, which would be 30 teaspoons, mix it with RO and add one third each day.  I edited my earlier post, so you may get an idea of how much to add at a time.  I did not dump the 20 mls in all at once.  I used a 10 ml large syringe and added it in dribbles where the water movement was highest and second highest. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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