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			 Our TDS is pretty low so the RO membrane can last 2+ years (currently mine is working on 4 years because I'm lazy and the TDS still reads at 0 or close enough for me).  DI will probably last you close to a year and the filters about 9 months or so.  You need to keep on top of the filters as the carbon filter removes chlorine/chloramine which can harm the membrane. 
		
	
		
		
		
		
			
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