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Thread: Newbie First Self Test High CYA

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    Join Date
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    Newbie First Self Test High CYA

    Hello. First time pool owner. We just moved into a fixer upper house and a neglected pool. It seems they have been using the pucks forever and we have terrible calcium scale on the tiles that I think will need to be pumiced off.

    Here are the first results using the Taylor k-2006:
    FC 1.2
    CC 0
    PH 7.8
    TA 140
    CH 440+
    CYA 100+

    Water temp is 53F. Air is 45F.

    Water is crystal clear, no signs of algae.

    Does this seem right? Do I need to retest?

    Do I need to slam? Not sure what to do next.

    I know I need to drain and refill some water. Do I need to do that now or can it wait until Spring?
    Circa 1997 35k IG free form plaster pool with attached spa, Purex-Triton 3 HP Pump, Purex-Triton FNS 60 DE Filter, Polaris 280

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    Mod Squad jblizzle's Avatar
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    Re: Newbie First Self Test High CYA

    Welcome to TFP!!!

    With the cold water temp, the algae is much less likely to really take hold.

    You are right that you will need to replace a significant amount of water to get the CYA back down in range and then need to switch to bleach. Whether you do that now or in the spring is up to you. The water replacement should help to lower the CH some too.

    If you decide to wait, I would raise the FC up to about 10ppm and maintain it in the 8-10ppm range for the winter to ensure nothing starts growing too rapidly.

    BTW, use a 10ml water sample for the FAS-DPD chlorine test to save reagent and then each drop is 0.5ppm.
    Jason, TFP Moderator
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    linen's Avatar
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    Re: Newbie First Self Test High CYA

    Welcome to tfp, txpoolgal
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Patrick_B's Avatar
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    Re: Newbie First Self Test High CYA

    Welcome to the forum Txpg! You've gotten good advice and you're on the right track. It would be a great idea to start lowering your Cya through water changes this winter. 100+ Cya come summer will become a problem and a burden if you find yourself needing to SLAM. Enjoy the forums!
    TFP Moderator
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    Isaac-1's Avatar
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    Re: Newbie First Self Test High CYA

    I too would start the water replacement soon, if nothing else drain down a few inches before each major winter rain storm. Spring time and an algae bloom will sneak up on you before you know it.

    Ike
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Patrick_B's Avatar
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    Re: Newbie First Self Test High CYA

    I can only add that it will be much easier and less painful doing this in stages. By the time spring arrives, you'll be ready to care for the pool with ease and much less Chlorine.
    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

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