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Thread: CYA Test

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    CYA Test

    My pool is great chemically and is clear. I just loathe the CYA test. Just as the dot MAY disappear, I start to see my reflection on the surface of the testing tube. Hate that. I do the test with my back to the sun, waist level and all that... (And pour solution back in the bottle and retest). My reflected image is cute and all, but to check the dot, I have to lift the testing tube, shift it sideways, or bend forward. Then the dot faintly shows so I continue adding drops. Am I just a narcissist at heart, or is this normal?

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    aussieta's Avatar
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    Re: CYA Test

    there was a post a couple of years ago that i use
    usual back to sun at waist height and minimum of room temperature water
    but fill tube to 100 level then hold at waist level and have a quick look, dont stare at it for ages trying to decide if you can see dot
    then fill to next level and hold at waist level and have a look
    keep repeating until dot disappears with a quick look without staring
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    jrs_diesel's Avatar
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    Re: CYA Test

    I get that glaring reflection too. It is distracting at times.
    J.R.

    20K IG gunnite pool
    2HP Hayward single speed pump
    Cartridge filter

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    Re: CYA Test

    I get the reflection also. I like my CYA around 30 so the subjectivity of the test is especially bothersome because there's not much room for error.

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    Re: CYA Test

    If you move the bottom of the test tube around a little bit while you're taking a reading, you'll be able to perceive the movement of the dot below the reflections on the surface. Our eyes are much better at perceiving motion than perceiving subtle differences in shades of grey.
    25000-gallon semi-public IG concrete/plaster pool, Triton II sand filter
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    Volunteer pool caretaker for my condominium complex

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    lefty51's Avatar
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    Re: CYA Test

    I too have trouble deciding whether or not it's a dot. When you pour it back in the bottle to retry, do you shake the bottle before retrying or just pour it back and retest ? (I sometimes wonder if it's my bald head I am seeing or the dot )
    Si -central Mo. 32' x 16' -- 3'4" to 6' deep Vinyl liner - 16,500 Gals : Triton II filter -Duraglass 2 hp pump - 1 speed : SI-30 salt generator
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    Re: CYA Test

    I feel everyone's pain. The CYA test is the hardest.......but it gets better with practice.

    Try taking an average....pour it in the first time and if you think the dot is gone, stop the test and note the level.

    Then do the same a second and third time and then average it. I promise you will be surprised at how accurate you will soon be. Also remember to think of the results in terms of 10 ppm 30 ppm, 50 ppm, etc. No further precision is needed.

    Take heart that there is NO better test. All the testing companies use it as the standard. The strips are pretty worthless and the digital testers (ColorQ) often fail badly
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    borjis's Avatar
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    Re: CYA Test

    Quote Originally Posted by aussieta View Post
    there was a post a couple of years ago that i use
    usual back to sun at waist height and minimum of room temperature water
    but fill tube to 100 level then hold at waist level and have a quick look, dont stare at it for ages trying to decide if you can see dot
    then fill to next level and hold at waist level and have a look
    keep repeating until dot disappears with a quick look without staring
    I like that!
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
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    Re: CYA Test

    It's still very frustrating; FC for CYA of 10 vs 30 vs 50... It makes a difference if you're keeping a tight rein, right?

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    Patrick_B's Avatar
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    Re: CYA Test

    The margin of error is as much as 15 PPM, so don't sweat anything with tight control. This is one test where you don't need extreme precision.
    TFP Moderator
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    First Pool Judith's Avatar
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    Re: CYA Test

    WOW I did not realize the tube had to be waist high! I've been looking at it from like 12 inches away. Good info.
    Judith and Brian D
    16,000 gal; IG Quartscape; Cartridge Jandy CV460 (150 gpm Max); Jandy Pro 2.0 Variable
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    Fill Date 11/11/2013

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    Mod Squad pooldv's Avatar
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    Re: CYA Test

    here are some videos on how to do the tests.

    https://www.youtube.com/user/tf100te...e=results_main
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