I used untreated well water with the cheapest salt 20 years ago and things lived and died.  
 
Today I use a whole home Kinetico de-chlorinator and softener, a Vertex RO/DI, and high end salt and things still live and die.  
 
IMO the most important thing is to know what you're working with. 
		
	
		
		
		
		
		
	
		
		
	
	
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