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Thread: CYA Question

  1. Back To Top    #1

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    CYA Question

    I started last weekend trying to balance my pool after years of neglect.

    Here are my present readings, for what it's worth:

    FC 11
    pH 7.1
    TA 80
    CYA 20
    CH 1,100 - Yes I know it's a problem.

    This post is about the CYA.
    I started with 0 CYA according to my local pool store's test.
    I added 4 lb of HTH Stabilizer and Conditioner, Sunday before last. It was dissolved by last Tuesday or Wednesday.
    This past weekend it measured 20.
    Today it still measures 20.
    4 lbs should have brought it up to near 50 by today.

    Should I add more? I don't want to fooled by a delayed reaction and wind up with too much.

    I was really careful with the black dot test. It's a little subjective, but my wife and I both tested it and came to the same result.
    10,000 gal / Plaster / Cartridge Filter / 1 1/2 HP pump motor/ TF-100 test kit.

  2. Back To Top    #2
    linen's Avatar
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    Re: CYA Question

    I wouldn't add anymore yet. I agree, if your pool is 10000 gallons (how certain are you?) then 4 lbs should have raised it close to 50 ppm. How did you add the cya?
    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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    Re: CYA Question

    How did you add the CYA to the pool? Are you measuring it in bright sun with your back to the sun and holding the tube around waist level?
    16k gal plaster with raised spa, Jandy DEV60 filter, 2 HP 2-speed SHPF Jandy Stealth pump
    Hayward Aqua Rite T-15 SWCG, Jandy LXi 400k BTU NG heater, 350 sq.ft. of Sun Star solar panels, TF-100 Test Kit, Dolphin s300i Cleaner
    Test Kits . Pool Math . Chlorine/CYA Chart . The SLAM Process

  4. Back To Top    #4

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    Re: CYA Question

    I'm certain the pool is 10,000 gal. +- 200 gal.

    I put the CYA in a sock and put it in the skimmer.

    I did the test in the shade on my patio. My face was to a cloudy sky. I held it at waist level.

    I still have the solution. I'll go do it again with my back to the Sun.
    10,000 gal / Plaster / Cartridge Filter / 1 1/2 HP pump motor/ TF-100 test kit.

  5. Back To Top    #5
    linen's Avatar
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    Re: CYA Question

    Have you cleaned the filter since adding it?

    Like ping said, redo the test with the sun out but at your back.
    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.

  6. Back To Top    #6

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    Re: CYA Question

    No. I haven't cleaned the filter. It needs cleaning but I have purposely avoided doing it until the CYA had a chance to show up.
    10,000 gal / Plaster / Cartridge Filter / 1 1/2 HP pump motor/ TF-100 test kit.

  7. Back To Top    #7
    linen's Avatar
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    Re: CYA Question

    Good, just checking to make sure you haven't lost any that way. Do you have an autofill? If you do it could be hiding a leak and that could be diluting your cya.
    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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    Re: CYA Question

    I'm the autofill. I add about 3/4" a day or more. This is a hot Texas Sun and there is a lot of evaporation. There may be a small leak, but I am not aware of it.
    10,000 gal / Plaster / Cartridge Filter / 1 1/2 HP pump motor/ TF-100 test kit.

  9. Back To Top    #9
    Mod Squad jblizzle's Avatar
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    Re: CYA Question

    Your solution may be too old by now to re-look at it. Only good for 10-15 minutes I think after you mix it.

    If you do it again, realize you can pour it back and forth a few times to see if you keep getting the same result.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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  10. Back To Top    #10

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    Re: CYA Question

    I'll wait until tomorrow with a full Sun to retest it- new solution.
    10,000 gal / Plaster / Cartridge Filter / 1 1/2 HP pump motor/ TF-100 test kit.

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    Seanhan's Avatar
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    Re: CYA Question

    You can also use instant conditioner , its kinda expensive ..but 1 gallon will raise mine exactly 10 points.
    And you can see the results on your CYA test in about a hour.
    Sean Hannon
    30,000 Gallons gunite pool Coated by Fibertech
    Hayward Pro Grid 72 / Hayward multiport
    Circupool V3 VS pump
    CirCupool SWG RJ 60, 400.000 btu raypak , Built in SPA

  12. Back To Top    #12

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    Re: CYA Question

    Thanks- I might try that.
    I would need about a quart to bump mine up 10 points.
    I think 1/2 gallon is about $14.
    If mine hangs in at 20, I'll buy some.
    10,000 gal / Plaster / Cartridge Filter / 1 1/2 HP pump motor/ TF-100 test kit.

  13. Back To Top    #13
    Seanhan's Avatar
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    Re: CYA Question

    Also the instant conditioner does not mess up your PH.
    Sean Hannon
    30,000 Gallons gunite pool Coated by Fibertech
    Hayward Pro Grid 72 / Hayward multiport
    Circupool V3 VS pump
    CirCupool SWG RJ 60, 400.000 btu raypak , Built in SPA

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