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Thread: Drop CYA

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    Pepo's Avatar
    Join Date
    Mar 2015
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    Orlando, Florida
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    Drop CYA

    Hello,

    I just lower my CYA from 100 to 70 by replacing some water, I was using 10 as a target for FC with a CYA of 100.
    How much wil be now my FC target with 70 CYA?
    I will replace more water in few weeks to hopefully bring it to 40-50.

    Thanks in advance for your help!
    15k Gal. ig Pool & Spa quartz plaster, Hayward super pump II 2.5 HP, Hayward 425 sf. cartridge filter,
    PS-4 Goldline automation, SWG(not working) using liquid chlorine now, Hayward 250k BTU propane spa heater.

  2. Back To Top    #2

    Join Date
    Aug 2014
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    Seminole, FL
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    92

    Re: Drop CYA

    FC should be 8 for a non-SWG pool while yours isn't working

    FC/CYA Chart

    Mike
    Built 1980, 19' x 30' almost rectangular, screened 15,000 gal, plaster, Hayward DE 3620 filter (currently using cellulose), Emerson 1081 1HP pump, AquaCal Heatwave SuperQuiet SQ110R heater, Zodiac T5 Cleaner, Taylor K-2006 test kit

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    Patrick_B's Avatar
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    Jun 2011
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    Midland TX
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    Re: Drop CYA

    Welcome to TFP Pepo,

    See the link for Pool School above. In there is a handy Cya/Chlorine chart to give you the answer.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  4. Back To Top    #4
    Texas Splash's Avatar
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    South-Central Texas, Marion/San Antonio
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    Re: Drop CYA

    Hello Pepo. Not sure I'm following your question, so let's try to confirm a couple things:
    1 - The Recommended Levels chart for your pool (link below) says FC should be 5-8; that's on any given (regular) day
    2 - Now if you were doing a "SLAM" (because pool is green), then we specifically match the FC to your current CYA based on the Chlorine/CYA Chart link below; for 70 the FC would be 28.

    You already know your CYA is a bit high (should be 30-50 for non-working SWG), so you might have to watch your FC more closely and adjust as necessary to keep it ideally at 8, but never lower than 5.

    Did that answer your question? If you need more help, please let us know.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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  5. Back To Top    #5
    Pepo's Avatar
    Join Date
    Mar 2015
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    Orlando, Florida
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    Re: Drop CYA

    Thanks to all,
    I will use 8 as a target for FC.
    15k Gal. ig Pool & Spa quartz plaster, Hayward super pump II 2.5 HP, Hayward 425 sf. cartridge filter,
    PS-4 Goldline automation, SWG(not working) using liquid chlorine now, Hayward 250k BTU propane spa heater.

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