Water in the GVRD is supplied by 3 reservoirs so the water quality is quite similar.  We get a TDS around 15-20ppm. 
 
You can go RO and add the DI unit later or you can go with DI only. 
 
Check any of the vendors and you will find something under $200 that fits your needs. 
 
Cheers, 
Vic 
		
	
		
		
		
		
		
	
		
		
	
	
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