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					Originally Posted by  gregzz4
					 
				 
				If 5ml of Prime in 50g of water removes 1mg/L, and there's 189L in a 50g ( give or take), doesn't this mean that you would need to add a whole lot of Prime (close to a litre of it) to remove that 1mg of Ammonia? 
  
189 * 5 = 945ml of Prime 
  
This tells me you would need to add almost a litre of Prime to remove just one mg of Ammonia in his 50g tank. 
  
Am I missing something here, or is this why people overdose Prime? 
  
			
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 1mg/L refers to concentration of NH4. Not dosage. So you don't need to time 189L. Actually since Brad has (had, since then he connects the QT to his sump) 50 G, he only needs to dose 5 ml to lower the whole tank of NH4 by 1mg/L (theoretically).