Im with kien on this one. 
Really you will see the plus/minus in a short time. 
When i changed from ro/di to tap water i noticed a short outbreak of algea but that soon went away. If your a SPS guy, you really should stay with the rodi. 
RODI, someone should name their kid that 
hahaha 
Hey RODI. 
		
	
		
		
		
		
			
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