If you want to accurately I mean really accurately measure use water dissipation, if not do the cross multiply of 250mls = 1 cup 
 
 
Or I'm sure there is an online calculator I think I used 1/3rd of what what the max recommended dose I wouldn't expect you seeing any change in your nitrates for 5-8 weeks due to it needs to culture the bacteria! 
		
	
		
		
		
		
		
	
		
		
	
	
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