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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