Anywhere from when it's clear (after adjusting for salinity) to a couple days ahead... If too much water evaporates from my mixing bucket (I try to avoid this anyhow, distilled water isn't cheap) there is a white deposit left on the pump and bucket since I dose the freshly mixed water with calcium and magnesium while it's mixing. The pump heats the water to a reasonable temperature also, so I don't use a heater. 
		
	
		
		
		
		
			
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				Calvin 
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Planning a 29 gallon mixed reef...
			 
		
		
		
		
	
		
		
	
	
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