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Thread: High CYA

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    Join Date
    Sep 2015
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    High CYA

    Moderator Note - Moved from here: High CYA did a water dump next steps to keep it down? - Page 2


    I too have a similar issue with high CYA. It's been around 100-115 all season. Had kept FC at 2 and high on the 4 end (or so I thought it was high until I saw the chart). Just recovered (hopefully) from a yellow algae outbreak. It wasn't noticeable to most people so hopefully I caught it early enough that I killed all of it. Water was clearer today than it had been in over a week and no sign of algae when brushing.

    Back to the CYA... Draining 30% appears to be the best option. Since I will be closing the pool soon, should I drain now and leave it at 70%, drain and refill, or do nothing until next season? The pool will be covered and I have already purchased a winterize kit.

    (Not hi-jacking the thread - just tagging alone since we are both in the same situation.)

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    Texas Splash's Avatar
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    Re: High CYA

    If you can drain now and adjust your CYA from 100+ down to about 70, I think that would be a good idea. If nothing else, just to ensure you know exactly how much bleach to use for your final winter-prep SLAM when you close for the season. Otherwise, you would just be guessing.
    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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    Re: High CYA

    Some people in the area drain their water level below the returns. Will that be a bad idea to drain it that low and keep it over the winter?

    Vinyl in-ground pool.

    PS - Working on getting the signature setup.

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    rdshackleford's Avatar
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    Re: High CYA

    Please refer us to a thread for this...
    Quote Originally Posted by Texas Splash View Post
    ...your final winter-prep SLAM when you close for the season.
    29,085.1 gal inground grecian vinyl, Hayward Super Pump VS, Hayward S-240 sand filter, Dolphin Nautilus Plus (aka Agador Spartacus), Taylor K-2006 kit, nice pool brush, crappy leaf net, frogs

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    pabeader's Avatar
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    May 2015
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    Dallas Ga
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    Re: High CYA

    It's part of pool school

    Found here: Pool School - Pool School Index

    For Inground pools: Pool School - Closing an In Ground Pool
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    rdshackleford's Avatar
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    Re: High CYA

    Excellent, thank you.
    -R
    29,085.1 gal inground grecian vinyl, Hayward Super Pump VS, Hayward S-240 sand filter, Dolphin Nautilus Plus (aka Agador Spartacus), Taylor K-2006 kit, nice pool brush, crappy leaf net, frogs

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