You should search the forums here on salt polls.  That will tell you a lot. 
 
I personally believe that buying the cheapest salt just makes my job harder so I try to buy quality.  That's only my opinion though and there are many people on here running un-believable tanks on the cheapest salts around that may disprove my opinion completely. 
		
	
		
		
		
		
			
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				Mark...
  
290g Peninsula Display, 425g total volume.  Setup Jan 2013.
			  
		
		
		
		
	
		
		
	
	
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