My skimmer goes off line for 12 hours. 9 pm to 9 am for the very same reason, to keep Nitrates at detectable levels. If I have to adjust down for any reason I will run the skimmer 18 hours. I rarely ever have to dial down Nitrates and phosphate is left to wander although I have a tough time getting the numbers past .07 and test with Hanna. 
		
	
		
		
		
		
			
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				Cheers 
Gary 
604-319-0317
			 
		
		
		
		
	
		
		
	
	
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