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Thread: High CYA level - 120 - Drain half of the pool?

  1. Back To Top    #1

    Join Date
    Jul 2009
    El Paso, TX

    High CYA level - 120 - Drain half of the pool?

    My pool has a CYA level of 120. I was using Dichlor and Trichlor for years but recently switched to bleach. Should I drain half of the pool and then refill it?

    Also, the hardness of the pool is 310. Will I need to add calcium after I refill it? If so, should I just use calcium hypochlorite shock as my chlorine source until the hardness returns to normal?
    1) 20000 gal
    2) DE filter
    3) In Ground
    4) Plaster

  2. Back To Top    #2
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    SWSuburban Chicago, IL

    Re: High CYA level - 120 - Drain half of the pool?

    If the CYA result is from a test strip, I'd have it confirmed with a drop based test, even if it's the 6-way from wal-mart, which is more accurate than test strips.

    I wouldn't drain unless I had an accurate CYA reading from a drop-based kit.

    If you do drain, yes, you can use cal-hypo to chlorinate and raise the calcium level into range.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner

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