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Thread: Proper Measuring for CYA Question

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    Join Date
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    Proper Measuring for CYA Question

    Hello everyone! I am on the verge of doing a 1/3 drain on my pool due to high CYA readings.

    I did my first CYA test with the Taylor Kit 2006 and the results were 120 ppm. Then I read this article http://www.taylortechnologies.com/Ch...P?ContentID=36 and followed their steps and came up with 60 X 2 = 120ppm. I am postive the CYA is at or near 120ppm.

    I went to Leslies Pools and had them do a CYA test and they came up with 40-50ppm.

    Please advise on the accuracy of CYA tests.

    My results:

    PH 7.5
    TA 80
    FC 11
    CC 0
    CH 310
    CYA 120

    Thanks!
    20K gal, 15X30, IG, Plaster, Pentair VF-3050 Intelliflo Pump, Pentair Clean&Clear Cartridge Filter, SWG

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    Re: Proper Measuring for CYA Question

    Frankly, with the CYA test, it's hard to say which one is accurate. So many people have a difficult time reading that test. I know that I do.

    Personally, I've had very good luck using Leslie's to test my water. Here's what I would do. Have your water tested a couple more times. At Leslie's by another person or at another Leslie's or even other pool stores, if you wish. Though, I find it's other pool stores who seem to be wildly off, especially if they use electronic testers, which may be out of calibration.

    I'd hate for you to dump water needlessly or dose your pool incorrectly.
    Buggs

    14,000 gallon, in ground, plaster, free form, play pool.
    Sta-Rite Max-E-Glass with a 1.5 hp Emerson motor
    WaterCo Micron High Rate sand filter S750 490 lb, 4883 sq ft - using ZeoBest
    In floor Polaris cleaning system
    Blue Diamond robot for those after storm days when I can't wait overnight for the in floor to clean it.

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    Re: Proper Measuring for CYA Question

    Are you absolutely certain the black dot is completely obscured? Try wiggling the tube a little, sometimes that makes you notice the dot again. Perform the test outdoors during the day, in the shade; if your light is too dim the test will read incorrectly high.

    It is true that the level of training, expertise, and care exhibited by pool store employees varies widely. You are almost certainly being more careful than they are; but in this case the discrepancy is so huge it's worth verifying as Buggsw suggests.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

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    Re: Proper Measuring for CYA Question

    Assuming that you followed the instructions to a tee, I would tend to believe your CYA testing results over the pool store's.

    The CYA test tends to be one of the toughest for folks to learn how to read since it is a turbidity measurement and not a color comparison. I'm with PaulR when he suggests performing the test outside in the shade. I do my CYA testing outside, on a bright and sunny day, in the shade. If I don't have those conditions, then I wait and test when I do have them. It's consistent that way.
    10K gallon IG gunite with waterfall; Pentair CC320P filter; WhisperFlo 2 HP pump
    TF Test Kits - Pool Math - Pool School
    "It depends."- JohnT

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    frustratedpoolmom's Avatar
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    Re: Proper Measuring for CYA Question

    Quote Originally Posted by 257WbyMag
    Assuming that you followed the instructions to a tee, I would tend to believe your CYA testing results over the pool store's.
    Me too.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Proper Measuring for CYA Question

    You can follow the instructions to a tee and still be incorrect. Poor eyesight, perhaps even the beginnings of cataracts or other vision problems can contribute to an incorrect test reading.
    Buggs

    14,000 gallon, in ground, plaster, free form, play pool.
    Sta-Rite Max-E-Glass with a 1.5 hp Emerson motor
    WaterCo Micron High Rate sand filter S750 490 lb, 4883 sq ft - using ZeoBest
    In floor Polaris cleaning system
    Blue Diamond robot for those after storm days when I can't wait overnight for the in floor to clean it.

  7. Back To Top    #7
    Guest

    Re: Proper Measuring for CYA Question

    Having worked in pool stores and knowing the competency of the average pool store employee AND the type of training they receive I would trust your test over Leslies, bad eyesight or not!

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    Re: Proper Measuring for CYA Question

    Thank you for your replies.

    I agree that the CYA test is difficult due to the variations of poor vision to great vision of the eyes. I will have the CYA levels tested at a different Leslie's store and see what results I get. My wife also did the test and came up with the same results as myself 120ppm.

    Your support is appreaciated
    20K gal, 15X30, IG, Plaster, Pentair VF-3050 Intelliflo Pump, Pentair Clean&Clear Cartridge Filter, SWG

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    chris4150's Avatar
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    Re: Proper Measuring for CYA Question

    Let us know what your next Leslies test results are. I can profess to the possible errors of CYA testing at pool stores. For example, I just had my pool refilled and decided to have my water tested, despite having my T-100 kit, and I was told my CYA was 60

    Now, for most of us here on TFP, a reading of 60 seems a bit extreme since I just filled my pool with fresh water. So I decided to to test my pool water myself via T-100 and my CYA was 0 as expected. The water in the tube was completely clear. Just goes to show.
    13,500 gallon free form Pebble Tec pool- 2 skimmers
    Pentair Intelli-Flow filter pump, Pentair Intelli-Super Flo booster pump, waterfall pump, Del Ozone Eclipse 1 generator, Pentair Clean & Clear Plus Cartridge filtration, Nature 2 XG Clear Vision, In-line Chlorinator, Polaris 280, Raypack heater, and Color Logic LED lights.

    Proud user of BBB, pool school, pool calculator, TF-100, and the advice of the friendly people here!

  10. Back To Top    #10

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    Re: Proper Measuring for CYA Question

    Update on my CYA levels.

    I just had Leslie's Pool do the CYA test (I went to a different location this time) and they tested my CYA level at 100. Thanks for all of your help....this is a great forum.
    20K gal, 15X30, IG, Plaster, Pentair VF-3050 Intelliflo Pump, Pentair Clean&Clear Cartridge Filter, SWG

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