I do about 70g a week water changes and IMO it is worth it.  I had the misfortune to get in on the bad batch of IO salt a couple of years ago and it wiped out my entire tank.  Then there was the Kent salt fiasco of last year.  Compared to some other things I buy for my obsession salt is really a small fraction. 
		
	
		
		
		
		
		
	
		
		
	
	
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