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Thread: CYA over 100ppm

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    CYA over 100ppm

    Hello everybody, new guy here
    So I recently tested my pool water with a k-2006 kit and here are the results I got for my pool water
    PH: 7.4
    FC: 0.4ppm
    CC: 0.6ppm
    TA: 125ppm
    CH: 500ppm
    CYA: over 100ppm

    Algae present: yes
    Type of algae: yellow

    -Fill water
    CH: 220ppm
    TA: 220ppm

    So my question is, should I do a partial drain and refill to remove some of the CYA?
    And also, is there a correct way to drain off some water? I dont want to damage the plaster.
    30K inground plaster pool, Pentair FNS plus 48 DE filter, pentair superflo 1.5 HP 2 speed.

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    Mod Squad Bama Rambler's Avatar
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    Re: CYA over 100ppm

    Yes you need to drain about half the water to begin with. Then retest and see where you're at.
    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
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    JasonLion's Avatar
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    Re: CYA over 100ppm

    Drain about half, refill to normal water level, and then retest to see where you are.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Join Date
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    Re: CYA over 100ppm

    after the drain and refill shocking will be much easier
    while your draining and refilling read pool school button at the top right of the page
    18x52 intex ultra frame pool 6981 gallons, 1 HP LL pump with 19 in sand filter,BBB method,borax 50ppm
    leslies DPD test kit + fas-dpd chlorine test kit + borates test strips
    thru wall skimmer,hard plumbed with 2 returns 1 1/2 sch 40 pvc
    1 large fountain 1 inch sch 40 pvc,shut off ball valves on all

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    Mod Squad Bama Rambler's Avatar
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    Re: CYA over 100ppm

    Sorry I omitted the refill part!
    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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