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Thread: Can the CYA stay lower in the winter?

  1. Back To Top    #1

    Join Date
    Jun 2014
    Houston, Texas

    Can the CYA stay lower in the winter?

    the water is cold. Our FC has been 3.5-5. Last water reading was tonight and is:
    FC 3.5
    no CC
    CALC 300
    TA 60
    CYA 40
    pH 7.5,6-ish

    Water is crystal clear. Just wondering if it's okay to leave the CYA where it is for now.
    19k SW IG
    Wet Edge pebble tech = new 5/16 (replaster)
    Hayward variable speed pump/Shark for cleaning
    New - filled 10/18/14 - TFP 100 test kit

  2. Back To Top    #2

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Can the CYA stay lower in the winter?

    Yes, that should be fine. The active chlorine level is lower at lower temperatures (for the same FC/CYA ratio) and there's less sunlight on the pool so a higher CYA isn't needed. You can raise it higher when you open in the spring.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  3. Back To Top    #3
    langerking's Avatar
    Join Date
    Jul 2013
    Clermont, Florida (that's near Disney World)

    Re: Can the CYA stay lower in the winter?

    Wait, 40 CYA is low? I thought that is about perfect. I always try to target 40.

    Nevermind - just realized you are on a SWG system.
    1) 21,000 gallons
    2) DE
    3) IG (in ground)
    4) Vinyl
    5) Hayward 1.5 hp DE 3600 72 GPM

    Taylor K-2006
    STA-RITE Great White GW9500

  4. Back To Top    #4
    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: Can the CYA stay lower in the winter?

    40 is kinda low for HOUSTON in the summer for FC related burn off depending on amount of full sun.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

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