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Thread: FC goes up overnight..?

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    tjt040774's Avatar
    Join Date
    Apr 2009

    FC goes up overnight..?

    I know there was another recent thread on this, but mine appears to be different. I did the FC overnight test two nights in a row and got the same result. In the evening after the pumps shut down, I get a FC level of 8.5. The following morning, before the pumps kick on, or sunlight hits the pool, my FC jumps up to 10. I have no other sources of chlorine other than the SWG. I am wondering if it might have something to do with water temp. By the way, the reason I am testing is b/c my water is a touch cloudy. Can't really tell too much during the day, but when I kick on the lights at night time is when I can see it. It's not bad, and my wife says I'm crazy, but trust me it's there. All my numbers are good with the exception of needing to bump up the CH a touch. That number is currently at 200, which oddly enough has been dropping for a few months.
    Approx 18,000 gallons, Jandy CL 580 Cartridge, Gunite, 2 1/2 hp 2 speed Jandy, Aquapure 1400, Polaris 280 w/booster, LXi Jandy Heater, Jandy PDA 6, PebbleTec: Tahoe Blue, Depth: 3 1/2' to 6', Perimeter: Approximately 95', Spa: 10' x 7'

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: FC goes up overnight..?

    Are you turning off the SWG during the test?

    The pump should be on for an hour before you test. It makes sure the water is mixed.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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