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Thread: Fc to cya

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    Join Date
    Jun 2016
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    Michigan
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    50

    Fc to cya

    The Cya in my pool is at 150 it's gone up substantially from 75-100 in a couple of days (Ive heard the chlorine tablets can do that). Anyway should I raise the fc in the water? Cdc recommends 1-3ppm and at least 2 if the Cya is high? Right now fc is at 5ppm. Thanks for the help in advance.

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    bobodaclown's Avatar
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    Apr 2011
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    Re: Fc to cya

    OMG! Yes.... You're really high enough to do a partial drain and fill.
    Have you seen this CYA/FC relationship chart? Pool School - Chlorine / CYA Chart

    You may want to visit pool school: Pool School - Getting Started
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    May 2016
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    Orange, TX
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    Re: Fc to cya

    I'd say a few days of 50 cya ppm increase is more than tabs too. In other words, Tabs + a powered shock w/ CYA in it, or accidentally adding Stablilizer. One more, the CYA tests aren't the easiest, but easy enough with the Taylor and TFT kits, but they must be done properly. Maybe just a testing mixup? On average, a 3" Trichlor puck will add about 3ppm CYA per week to your pool if dissolved. There is plenty of wiggle room there, but what I'm getting at is if you jumped it that high that quickly, there's a lot of tabs in there, or a powered "shock" product containing stabilizer, or both.
    Lee Mims - Orange, TX, 25400 gallon In-Ground Plaster Pool
    Hayward Cartridge Filter, Hayward Chlorine Feeder, Century 1081 2-Speed Pool & Spa Pump, Hayward H350FDN (350k BTU) Natural Gas Water Heater, Paramount O3 Ozone, Hayward Super II Pump for Waterfall, Aqualink RS System w/ Remote (Jandy), Taylor K-2006 Kit

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    Jun 2016
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    Michigan
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    Re: Fc to cya

    I was going to do a drain soon, but it's 90 today and the weather wasn't going to last is it OK to swim in?

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    bobodaclown's Avatar
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    Apr 2011
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    Re: Fc to cya

    Sure.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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