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Thread: CYA standard testing

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    CYA standard testing

    Last fall, I got some of the 50ppM CYA standard to help me test the CYA. When I used it for a CYA test I saw that the black dot had to really disappear to find the correct reading.

    Today I rechecked with the standard and the black dot disappears around 80-70, not 50. I did this at first outside in sunlight with my back to the sun, but even in full sunlight, the dot is still not visible at 70.

    Is there an expiration on the standard? OR maybe I have done something else wrong. I filled the test bottle to the bottom of the label with the standard, and then to the top of the label with the reagent, I did overshot and went just above the label with the reagent. Shook it for 30 seconds and then tested. What am I missing?

    thanks

    Don
    27,000 gallon, dark gray Sunstone quartz aggregate plaster, Hayward DE filter, Dallas TX

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    Richard320's Avatar
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    Re: CYA standard testing

    I get way different readings if I grip the tube normally versus only holding it between my thumb and forefinger.
    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!

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    Re: CYA standard testing

    I would say that the standard solution should be good for at least 18 months. What I have told folks in the past is this: Assume that the 50ppm solution is right. That means you need to adjust your environment until you get a reading of 50. In your case, you need a little more light than before. Like Richard said, watch your finger placement.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Re: CYA standard testing

    +1 what pabeader said
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    lefty51's Avatar
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    Re: CYA standard testing

    Duraleigh says, oh great lefty's on here commenting about CYA testing again .

    +1 on all the comments posted here. CYA testing can be a pain. I sometimes use the standard to get a reading, then rinse and do the real test right after to have a reference point. Richards two finger method made a big difference in what I saw when testing.

    By the way, my standard solution is almost a year old and is still good despite (don't tell anybody) that it sat out in the shop all winter during some very cold days.

    P.S- Dave will like this, I'm thinking of getting another bottle and test tube and doing real and standard testing simultaneously to get a REAL accurate reading. I know overkill
    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
    TF-100 with speedstir

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    Mod Squad kimkats's Avatar
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    Re: CYA standard testing

    Lefty! Not overkill at all! It is in the name of science and for the good of all TFP pools!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    lefty51's Avatar
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    Re: CYA standard testing

    Gee, I hope people don't start confusing me with Chemgeek
    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
    TF-100 with speedstir

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