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Thread: CYA Level Raised More than Planned

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    Join Date
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    CYA Level Raised More than Planned

    We just had our pool remodel finished last week. New vinyl liner and had water trucked in. Tested using my kit at home the other day and had CYA = 0. Pool stored tested it as well and said CYA= 2ppm.

    So I went to Wally World and bought Stabalizer/Conditioner, brand HTH. Says it is 96% CYA. I have a 20,000 gal pool. Yesterday, I added 8 lbs of the stuff using socks in front of returns method. Today I tested my CYA and it appears to be at 100ppm!!! Which is crazy because according to the instructions of the HTH product, 8 lbs should only have raised my CYA to 40-50ppm maximum.

    Is the CYA test that subjective that my CYA is probably much lower than 100ppm? or are the HTH product directions that far off? Based on pool calc, I would have expected the CYA to go no higher than 50ppm.
    - Max
    __________________________________
    20k gal, inground vinyl, 1 1/2 HP Hayward SuperPump, HW Veriflow XL Sand Filter, Hayward Aqua Rite T-Cell-9, AquaComfort Heat Pump ACT-1100
    Hayward TigerShark robotic cleaner

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    Richard320's Avatar
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    Re: CYA Level Raised More than Planned

    I'd suspect it hadn't mixed throughout the pool yet. Treat as if you hit your target and recheck it in a couple days.
    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.
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    lmnconn's Avatar
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    Re: CYA Level Raised More than Planned

    I had the same thing happen to me with HTH stabilizer/conditioner. I added 7lbs trying to get my CYA to 40-50 range. Ended up at 80 and have had trouble getting it to lower. Next time, I will know to do it gradually. Sounds like you will be doing a lot of draining and refilling to bring that number down.
    St. Louis, MO, 25000 gal, 16x32 lagoon, vinyl, sand filter, Hayward pump, chlorine, install complete 9/12, Taylor TF100 test kit

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    Re: CYA Level Raised More than Planned

    If your pool is 20k and you added 8 lbs of CYA, you can be just about 100% sure your CYA is 45 ppm.

    The dosage is the critical thing. How are you testing? Is your procedure spot on?

    It would be impossible for your CYA to be 100 unless you put in enough to get to 100 and it doesn't seem like you did.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: CYA Level Raised More than Planned

    Went to the pool store this morning and had my water tested. They get CYA reading of 43 ppm. So that falls right in line with what I added. That kit test with the black dot in the bottom of the tube was giving my reading this morning somewhere between 70 and 90. Maybe I'm doing something wrong with the test? I've always found it to be hit or miss, I've been using Taylor kits for 2 years, and got all new refills for this year I'm using. Getting some "off" numbers with other stuff but I'll start a new thread for that.
    - Max
    __________________________________
    20k gal, inground vinyl, 1 1/2 HP Hayward SuperPump, HW Veriflow XL Sand Filter, Hayward Aqua Rite T-Cell-9, AquaComfort Heat Pump ACT-1100
    Hayward TigerShark robotic cleaner

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    Re: CYA Level Raised More than Planned

    Keep your posts under this thread so folks can see the background of your test results.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    tackettaj's Avatar
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    Re: CYA Level Raised More than Planned

    Test CYA with your back to the sun and the tube(s) held at your waist. Following this each time will give you a more consistent and accurate reading.

    One of the Senior Members also recommended shake for 30 sec, pause and then shake for another 30 sec to ensure it's mixed well. I follow it and get pretty consistent results each time I test.
    -25,000 gal. freeform gunite, smooth quartz finish w/ spa
    -2 hp Jandy Pro Series Stealth; Jandy Pro Series Cartridge Filter (CV340)
    -Jandy Pro Series AquaPure Chlorinator; Jandy Pro Series JXi Heater
    -Zodiac MX8 cleaner; Taylor K-2005 DPD Complete Chlorine Kit




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    Swampwoman's Avatar
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    Re: CYA Level Raised More than Planned

    Here's a link to a video to help with the CYA test: Testing Cyanuric Acid with the TF-100 - YouTube

    Also, I recently purchased the 50ppm compare water from TFTestkits.net to help a newbie friend learn to read it right ( because the water is a known qty of cya) and discovered that I tend to read about 5 pm "light". It was kinda revealing and helped me so maybe it would help you too
    In ground extended Grecian, 22,000 gal, Hayward 220t sand filter, vinyl liner, dolphin m4 supreme.
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    Helpful Links:
    GET A TEST KIT Chlorine/CYA Chart How to SLAM About Metals & Stains

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