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Thread: High CYA in socal

  1. Back To Top    #1

    Join Date
    Sep 2010
    Yorba Linda, CA

    High CYA in socal

    My pool was installed in Q1 and started using it in March. I’ve been using a pool guy to stay on top the chemicals and been cleaning it myself. For a number of weeks I’ve been getting mustard Algae. I did the usual thing of brush it off to find it re-appears the next day or so. I wasn’t too pleased with the pool guy’s response when I asked him about the condition of the pool. He assured me all was OK. So I took a sample of water to Leslie’s and found there was no FC and the CYA was through the roof! So the pool guy was shown the door and I found this board. I managed to treat the mustard algae by raising the FC and shocking a number of times over 3 days. I also used yellow out.

    Here are my current numbers:-
    FC – 1.5
    CC - 0
    pH – 7.6
    TA – 100
    CH - Not known
    CYA – 100+

    My plan moving forward is Drain pool by a few feet to help reduce CYA level (I know I may have do this a few times) And to stop using the Chlorine tabs. I bought the Leslie’s FAS-DPD test kit so I can stay on top of the water testing.
    My question is, should I reduce the CYA through draining or will evaporation and an auto leveler be enough over time to bring it down? I live in Southern California so we lose a lot to the sun/heat.

    15000 Gals, Catridge, IG, plaster, intelliflo VS-3050

  2. Back To Top    #2
    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Tucson, AZ

    Re: High CYA in socal

    CYA doesn't evaporate, so that won't work (Sorry!). I wish it would, cause then I could lower my CH the same way! Sorry to hear about the pool service debacle; unfortunately it's all too common. Once you drain and refill, post up some more test results (including CH) and we'll help you get squared away.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
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  3. Back To Top    #3

    Re: High CYA in socal

    Or see if you can get an R/O treatment, to save water. They are not available everywhere, so you'll have to check your area.

    You need to get your FC level up. It is dangerously low and an algae bloom is just around the corner

  4. Back To Top    #4
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: High CYA in socal

    Quote Originally Posted by smcgough
    My question is, should I reduce the CYA through draining or will evaporation and an auto leveler be enough over time to bring it down? I live in Southern California so we lose a lot to the sun/heat.

    Water evaporates, but CYA and Calcium are forever.

    2 ways to get rid of the CYA: drain, or reverse osmosis.

    Where'd you get the numbers? A test strip, or drop testing? If it's a strip, I wouldn't be too hasty to drain yet. They're somewhat better than tasting the water, but not much. You might be below 100. Who knows?

    If it's a drop test, try diluting your sample 50/50 with tap water, then mix it with the reagent, then get your reading and double it. If you don't know where you are, you won't know how much you need to drain to get to a reasonable number.

    Yorba Linda's not that far from San Dimas... hmmmm...maybe a double R/O job during the off season could entice a certain firm to venture beyond San Diego and Riverside Counties...
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  5. Back To Top    #5

    Join Date
    Apr 2010
    Buckeye, AZ 85326

    Re: High CYA in socal

    I would hold off on the drain cycles you have planned. My CYA was above 100 and now it is down to 75ish due to rain, slpashout and my kid playing with the pump hose.
    75 is good for me.
    11,872 Gallon IG Shotcrete play pool
    Blue Granite Pebble Sheen finish
    Hayward SwimClear c4025, Navigator & Tristar 1.75hp pump
    2' Powerfall

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