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					Originally Posted by  StirCrazy
					 
				 
				the RO membrane its self will reduce ammonia to very low levels, depending on the PH of the water, design of the membrane and such, I supose if you still have residual ammonia you coudl use a DI, or other softener type ion-exchange.  but to say the ammonia carries on throught the RO untouched is not right at all.   
  
Steve 
			
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 I have seen this in my own fish only systems that get RO with no DI filtering. After carbon my tap water usually has about 2 ppm ammonia.  After the RO membrane there is still 2 ppm ammonia that I use a detoxifier on.  I'm using dual 150 gpd 98% rejection membranes.
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